repair, disassembly and troubleshooting of gearbox parts of VAZ 2108, VAZ 2109, VAZ 21099

The gearbox, in any car, is responsible for increasing and decreasing the speed of the drive wheels, at the same number of crankshaft revolutions. The engine itself is not powerful enough, and its normal operating range (without increased wear) ranges from 1500 to 4000 rpm. Therefore, in order for the engine to have different speeds at a given speed, the car uses a gearbox (gearbox).

By type, boxes are divided into 2 types - mechanical and automatic. In this article, we will talk specifically about the mechanics of a VAZ 2108 car.

VAZ 2108 – gearbox: arrangement of components, its repair and improvement

The domestic car is a car with front-wheel drive, and the engine is placed transversely and is used for driving along the highways. The metal body is made in accordance with the hatchback type, which has 3 doors. The rear door is designed for loading and unloading luggage. When transporting long and oversized luggage, the rear row folds down - this increases the luggage compartment.

4-cylinder carburetor engines with a volume of 1.1, 1.3 or 1.5 liters. At the moment, fuel injection systems are installed in some cars. The front-wheel drive car guarantees improved vehicle handling when cornering, even on wet roads. During long-term use of the car, wear of many elements occurs, the fasteners of the assembly components are weakened and the adjustable values are violated.

The gearbox is the most reliable element in the car. Failure of this mechanism is quite rare compared to other parts. And with all this, its complete or partial failure makes the car completely unsuitable for further use. It will simply be impossible to operate the car for its intended purpose. In addition, you will need a tow truck to deliver the car for gearbox repair.

About the oil

For good performance of the VAZ 2109, all important components must be coated with oil. Typically, the manufacturer independently determines the brand of engine and transmission parts that are recommended for use in cars of a given model.

If you do not have such information, you should consider the main purpose of the machine:

if the VAZ is driven on excellent roads in the regional center, there is a certain type of oil for this;
if you drive a car, a transmission would be the ideal option.

Remember to maintain the optimal oil level

When filling oil, it should be taken into account that the VAZ 2109 box requires a slightly larger amount. Only this approach will help protect and cover all spare parts located at the crankcase outlet.

Since the gearbox is the second most important element of a car, in the event of the slightest breakdown it is necessary to immediately eliminate the shortcomings. Let's look at the main malfunctions that can occur with the gearbox

Let's look at the main malfunctions that can occur with the gearbox.

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Automatic transmission shutdown

worn gears and locks on the coupling;
failure to comply with vehicle operating rules;
incorrectly selected speed mode;
incorrect shifting with a poorly adjusted clutch;
unprofessional gearbox repair (ignoring clutch replacement);
ignoring repairs in the presence of extraneous noise in the form of crunching.

If you contact a service station in a timely manner, the VAZ gearbox can somehow be saved. If the condition is too neglected, count on expensive repairs.

What do the noises in the 2109 box mean?

There are no silent boxes. Each of them has a maximum permissible noise level, which is established by GOST.

Extraneous noise from the VAZ box may occur as a result of the operation of gears and bearings;
Used or low-quality oil also causes noise;
Sometimes the reason for its appearance may be the operation of the power unit. In this case, the speed may be unstable or a powerful camshaft may be installed.

It takes forever to describe extraneous noises, since each driver hears them differently. To more fully understand the cause, it is necessary to diagnose the transmission.

Crunching sound when changing gear

Excessive or improper use of the vehicle.

If there is a crunching noise, the synchronizer will need to be replaced. If you decide to save money on it, you should expect to buy a whole block of gears in the future.

In addition, the presence of a crunching sound may indicate that it is time to change the used oil. Or perhaps it was filled with the wrong degree of viscosity?

Knocks

If you hear knocking noises in 21099, you should immediately check the gears

Perhaps one of the pairs has a chip; If a knocking noise occurs while driving, or when you switch the gearbox from one gear to another, pay attention to the satellites. Most likely they are the ones that have worn out.

The gearbox on a VAZ burst

Whether or not to purchase a new box is up to you. Judge for yourself, repairing it can cost you the same price as buying a new one.

The box is unstable and switches hard

The cause of this type of problem with box 21099 is the synchronizer or gear. In some cases, this situation may occur when purchasing new gearboxes or after repairing them.

Gearbox synchronizer

In any case, you should know that when buying a new car you need to run it in. Rough operation of the vehicle leads to serious problems.

Predominant types of breakdowns

One of the types of gearbox failures on the VAZ 2108 is considered to be bearing wear or lack of oil in the gear shift unit. And with all this, this damage is very easy to fix by changing the oil or replacing the bearings. It is completely different if we are talking about more serious breakdowns associated with axial rearrangement of shafts, bending of the gearbox handle, jamming, unreasonable inclusion, disabling of gears, wear of fasteners, various nuts, as well as springs due to deterioration of the flexibility of balls - in such situations, without a full repair, it is not possible make do.

Possible causes of VAZ 2109 gearbox failures

Gearbox: purpose, types of gearboxes, their advantages and disadvantages

Like any other device, the “nine” gearbox begins to fail over time. The quality of spare parts used during repairs also plays a significant role. If you adhere to the manufacturer’s recommendations, then gearbox repairs (including preventative ones, in the absence of breakdowns) should be performed every 50,000 km. Let's consider the main causes of gearbox breakdowns according to the “symptoms” listed above:

"outgoing gear"

Most likely, the gear block of the ejected gear is badly worn. The locks on the clutch or gear may be worn and these parts will need to be replaced. The main reason is systematic violation of operating rules, incorrect choice of speed mode, too sharp switching, incorrectly adjusted clutch.

transmission noise when operating in neutral gear

Any gearbox has a certain noise threshold, which cannot be an indicator of a breakdown; not a single gearbox operates absolutely silently. An increased noise level may indicate the need to change the oil in the box or its insufficient level. In addition, noise may increase if the engine is unstable. For example, if a sports camshaft was installed on the car, and the gearbox does not resonate with it. For a more accurate diagnosis, it is recommended to take it to the nearest service station, since the gearbox can make noise for many reasons, including those not related to the gearbox itself.

the gear engages with a crunch, shifting into gear is difficult

If the gearbox has a decent mileage, then the reason is most likely the wear of the synchronizer. It urgently needs to be replaced, as the situation is fraught with failure of the entire gear unit. When the gearbox is new, or the synchronizer has recently been changed, the gears may also be a bit difficult to engage - this is normal.

The gear does not engage smoothly and requires effort to engage

Difficulties when engaging a gear can be explained, as mentioned above, by replacing the synchronizer. Over time, the parts break in and switching is effortless. Immediately after replacing the synchronizer, it is not recommended to shift gears abruptly and maintain short pauses when switching. The transmission still does not engage - use a double squeeze. If the gear does not engage clearly, this may indicate a malfunction in the gear selection mechanism, as well as incorrect adjustment of the rocker or its support. To accurately determine the cause, you need to examine the backstage.

gearbox play - shift lever dangling

First of all, check the condition of the “cardan” (gearbox joint). Very often, the cause of play is a conical fastening bolt that can unscrew. Backlash can also occur in the rocker itself as a result of its wear. In this case, it is necessary to replace the link. In addition, the return spring may burst. This part is located in the gear selection mechanism - the gearbox will need to be repaired and the spring replaced.

the curtain rings

It should be noted that this is a very common drawback of all domestic cars, very often occurring after repairs to the chassis. Sometimes it happens the other way around - after repair, the clanging disappears (if it happened on a new car). The reason may be a manufacturing defect, which even AvtoVAZ representatives admit.

In addition, the reason may be vibration of the engine + gearbox, which is transmitted to the scenes. The ringing may be associated with the car body or incorrect choice of support points. In such cases, attempts are made to eliminate the ringing by installing an o-ring near the rocker (relevant only for VAZ 2108-2115).

oil leak from box

Possible reasons are poor fastening of the crankcase cover, loss of tightness of the shaft seals. In addition, you may need to replace the box seal or simply tighten the drain plug. It also doesn’t hurt to inspect the gearbox housing for damage and cracks.

Construction design and further repair of the gearbox

Repairing a VAZ 2108 gearbox is a very complex and time-consuming process, especially if the car has sufficient mileage. Despite multiple service stations, not all specialists will be able to make repairs. There can be many reasons for this. For example, there is little experience, as well as a lack of spare parts in stock. The gearbox is considered a complex element of the car. It is capable of changing the traction force of the driving wheels of a car due to the engagement of gears with different numbers of teeth.

In addition, it provides reverse gear and long-term disconnection of the engine (together with the clutch) from other elements of the transmission, while the car is stationary or moving forward by inertia. The engagement of gears with different numbers of teeth is realized by their movement. The drive shaft is connected to the clutch disc, while the driven shaft is connected to other transmission elements.

The driven shaft, in relation to the main one, is capable of rotating with a different number of revolutions. The transition shaft with a fixed set of gears through them is in constant engagement with the main shaft.

Description of design

Gearbox for cars VAZ 2108, 2109, 21099
Gearbox - manual shift, mechanical, two-shaft, with four or five forward gears and one reverse, with synchronizers in all forward gears. It is structurally combined with the differential and main gear. The production of four- and five-speed gearboxes with indexes 2108 and 21083, respectively, has now been discontinued. Box 2109 is supplied to the conveyor and for spare parts. It is distinguished by a different location of the crankcase ventilation breather - on the clutch housing (it used to be on the rear cover), the presence of an oil level dipstick, and a different lubrication system. Gear ratios remain the same. The gearbox housing consists of three parts (cast from aluminum alloy): clutch housing, gearbox housing and cover. To improve heat dissipation, their surface is ribbed.

The input shaft is index 21083. It is made as a block of drive gears, which are in constant engagement with the driven gears of all forward gears. The secondary shaft is also with index 21083. Its gears rotate on needle bearings. The main gear is machined integrally with the shaft.

Some 2109 boxes are equipped with 2110 shafts (the gears of the secondary shaft 2110 rotate on bushings to reduce noise). The main gear gear is removable and splined. It is fixed on the shaft with a locking ring. Inside the secondary shaft 2110 there is a groove for supplying lubricant to the gear bushings.

Gears are cylindrical, helical, constant mesh, with the exception of the spur gear in reverse gear. Each gear has an additional spur ring, to which the sliding clutches of the synchronizers are connected when the gear is engaged. Gears 2108 have radial holes for oil supply (splash lubrication), gears 2110 are lubricated with oil coming from the shaft. Gear sets are not interchangeable due to the difference in mounting holes and are supplied with the shaft.

The front shaft bearings are roller, the rear are ball. The radial clearance in roller bearings should not exceed 0.07 mm, in ball bearings - 0.04 mm. Under the front bearing of the secondary shaft of the 2110 shaft box there is an oil sump that directs the flow of oil into the shaft.

Differential - conical, two-satellite. The main drive driven gear is attached to the differential box flange. The speedometer drive drive gear is pressed onto the differential box, rotating the driven gear located in the speedometer drive housing, which is attached to the gearbox housing.

The gearbox control drive consists of a gear shift lever, a ball joint, a rod, a gear selection rod and gear selection and shift mechanisms.

A lever is attached to the inner end of the rod, which acts on the three-arm lever of the gear selection mechanism. This mechanism is made as a separate unit and is attached to the plane of the clutch housing.

The gear selection mechanism housing has two axes. One has a three-arm gear selector lever and two locking brackets. The other axis passes through the holes of the locking brackets, which prevents them from turning. One arm of the gear selector lever is used to engage forward gears, the other is used to engage reverse gear, and the third arm is used by the gear selector rod lever. A reverse fork is installed on the axle. Gear selection mechanisms 2108 and 21083 are installed on four- and five-speed gearboxes, respectively. The 2108 mechanism does not have a spring on the axis.

The gearbox is filled with transmission oil at the factory, designed for 75,000 km. It can be replaced with “Lukoil TM4-12”, “TNK TRANS KP” (80W-85; GL-4), from imported ones “ESSO GEAR OIL TDL” (75W-90, 80W-90; GL-4/5) are suitable. and "MULTIGEAR S" (75W-90; GL-4/5).

Disassembling the gearbox

In some cases, this happens - the box breaks, but the apparent reason is not immediately established. To identify it, the gearbox should be dismantled. Not everyone can immediately get to the service station, and you have to do the removal of the box yourself. For safety, disassembling it must be done by two people, since some parts with significant mass can injure a person if they fall.

First, remove the “+” terminal from the battery and drain the liquid from the box. After this procedure, remove the tray protection. There is a wire on the crankcase, called ground, attached with a bolt. This wire should be removed and moved slightly to the side so that it does not break during subsequent disassembly of the VAZ 2108 gearbox. First, remove the clutch cable. Then we separate the block from the starter relay. Unscrew the 3 bolts and disconnect the starter. Then we go under the car. Loosen the clamp and unhook the joint from the gear selector rod. Unscrew the speedometer drive cable and the wiring for the reverse speed light.

Then you need to unscrew the nuts located on the suspension arm. Unscrew the entire nut that connects the bracket and the brace. Next, turn the guy wires to the sides so that they don’t interfere with continuing disassembly. The cotter pin of the nut itself, which is responsible for securing the ball joint to the steering handle, should be unscrewed and pulled out. The tie rod assembly nuts should also be unscrewed.

The next thing is to knock out the ball pin from the rotation handle post. Then unscrew the 2 bolts and disconnect the ball joint with the steering knuckle. The shank should be knocked out from one of the CV joints of the drive wheels. This is where you need a mount. One CV joint has been freed, the second one should also be freed.

Then remove the crankcase cover. The tightening located between it and the cylinder block, which is attached to 3 bolts, should be loosened. Therefore, after removing the VAZ 2108 5 speed gearbox. the motor will remain without a lower support, and then you need to secure it. You need to do it like this:

Take a powerful wooden beam, the length of which is approximately 1.5 m.
Secure the front strut supports so that it is positioned above the engine.
Secure the motor to the beam using a chain or strong ropes.

After the motor is secured, you can safely disconnect the rear and left support from the frame of the machine. Then, move the box in the opposite direction from the engine until the input shaft is freed from the clutch. Be careful not to break the petals located on the clutch diaphragm spring.

In principle, the entire procedure is completed, now the gearbox from the VAZ 2108 engine can be further disassembled to replace worn elements.

Improving the gearbox by selecting gear ratios

Many techniques used in transmission tuning have been tested in motor sports. For any car, especially a sports one, the gearbox is an important element in realizing the dynamic qualities of the engine. Correctly selected gear ratios of the VAZ 2108 gearbox will make a car with a rather weak power unit fast.

Cars that require serious preparation use cam gearboxes. They are determined by many advantages - they can withstand quite large loads (using the shape of the tooth and the way the gear-cam clutch engages). They need less time to switch gears (due to incompletely squeezing the clutch or not squeezing it at all), especially since they do not destroy synchronizers (which simply do not exist).

But still, cam gearboxes are practically unsuitable for regular highway driving, since they produce a lot of noise (thanks to the use of spur gear pairs), they have “hard gear shifting” and have a fairly short resource. In addition, they are much more expensive than synchronized ones and must be constantly professionally maintained.

Synchronized gearboxes differ from conventional gearboxes only in gear ratios. Certain situations (VAZ eighth model) allow expansion to sixth gear. Good operation of the gearbox is achieved by effective selection of gear ratios of the main gearbox pair, the input shaft and the driven gears of the secondary shaft. The choice of gear ratios depends on the power and instantaneous capabilities of the engine, wheel diameter, and most importantly, on the desires of the motorist.

The gear ratio of the VAZ 2108 gearbox means the ratio of the number of teeth on the driven gear to the number of teeth on the drive gear. If it is increased, the transmission will become “more powerful”, also “shorter”, in a different way, the engine will turn the required number of revolutions. The car picks up speed quickly too, you just need to change gears often. This moment will only be reflected in a certain reduction in the maximum speed of the applied transmission.

Using an example, let’s take driving a VAZ eighth model with a 1.3 liter engine. with the main pair 4.5. It feels as if something very powerful was placed in the engine compartment, definitely not from a VAZ. Although the driver often needs to shift the gearshift knob of the VAZ 2108, the car is the first during any action, even at a traffic light. In sports cars, the gears used are the most “extreme” ones - 4.7, and on motocross cars - just 5.1.

Types of malfunctions and their causes

In order to correctly determine the malfunction and its cause, it is necessary not only to know the principle of operation of the mechanism, but to notice all the symptoms of something wrong.
“Flying” gear – the gear block associated with this very gear has worn out. Aged locks on the clutch and gear also manifest themselves in a similar way.

Rapid wear of some elements occurs due to violations in the operation of the vehicle, which are clearly stated in the instructions of the car manufacturer. Changing gears at the wrong speed limit has a detrimental effect on many vehicle systems, including the gearbox. Experts recommend doing this around 3000-3500 rpm. Instant speed changes without observing the required time interval of 2 seconds, especially with a broken or incorrectly configured clutch, also cause very rapid wear of gearbox elements. This results in an excessive load on the synchronizers, which affects the gear block and leads to their failure.

During repairs, an incompetent specialist or a careless owner often makes the same mistake - the engagement clutch is not replaced.

It is quite easy to determine whether the clutch in the gearbox was replaced after repairs in the cabin or not. The element that has not been replaced begins to produce a fairly distinct “crunch” when shifting a gear that is not working before repair. If the state of the mechanism is very neglected, then a minimal overhaul will no longer save the situation.

Each gearbox has an acceptable noise limit. If the sounds produced by the mechanism exceed the usual limit, then something is wrong. Based on this, we can say with confidence that not a single gearbox in a car operates absolutely silently.

GOST level of external noise for a standard gearbox is a maximum of 96 dB, and internal noise is 78 dB.

Unstable engine speed can also cause noise in the transmission. Therefore, if you doubt the serviceability of the device, it is better to send the car for diagnostics.

Hard shifts, idle shifting, slipping gears - all this can be treated with a gearbox overhaul. The reason, like the malfunction itself, can be different, depending on many factors, because a car is a complex mechanism with a mass of interconnected components and systems.

How to replace a gearbox on a VAZ 2108 car

Repairing a VAZ 2108 gearbox is not reasonable in all cases; exchange in most situations is more reasonable and simpler. You can buy a gearbox new or used. The choice of unit is determined by the advantages and financial capabilities of the car enthusiast. It is profitable to buy a used box for disassembly. There are serviceable spare parts on sale with less than half capacity. The advantages of used units are obvious.

The disassembled gearbox is exactly free of manufacturing defects (it has been tested on the highway), it has been diagnosed by professionals from the service center before sale, it is serviceable and efficient, and for all that, its cost is less than that of a new one. In reality, for a VAZ 2108 gearbox, the cost is determined by the node type (4 or 5 range) and the level of wear. By installing this gearbox, you can save money and time on repairs.

You can replace the VAZ 2108 gearbox from a 4-speed to a 5-speed. Then the car’s capabilities will become several times greater, this will also depend on the type of engine. After all, it happens that with a 4-range gearbox, the car seems to lack one more speed.

If the gearbox secondary shaft breaks, it should be corrected

It is necessary to clamp the secondary shaft of the VAZ 2108 gearbox in a vice with metal soft pads on the lips.
Using 2 pry bars, you need to compress the ball bearing located behind the secondary shaft.
Remove the thrust ring.
Remove the 4th speed driven gear.
Then remove the needle bearing of the 4th speed driven gear and be sure to mark it.
Then remove the spacer washer from the secondary shaft.
Using 2 pry bars, move the 3rd and 4th speed synchronizers through the third speed gear from the splines of the secondary shaft.
Remove the 4th speed needle bearing bushing.
Then remove the 3rd and 4th speed synchronizer with the 4th speed locking washer. Mark the synchronizer locking washer in relation to the synchronizer clutch.
Then remove the blocker from the secondary shaft. the 3rd speed gear synchronizer washer, then mark it in relation to the synchronizer clutch.
Remove the 3rd speed gear from the output shaft.
Remove the 3rd speed gear needle bearing from the output shaft, then mark the needle bearing.
Remove the thrust washer of the thrust rings.
Remove the 2 thrust half-rings from the secondary shaft.
Remove the ball that secures it from the hole on the secondary shaft.
Remove the 2nd speed gear from the output shaft.
Remove the 2nd gear needle bearing, then mark it.
Remove the lock washer (spring) from the secondary shaft.
Place the secondary shaft of the 1st speed gear on the lips of the vice, then, hitting the end of the secondary shaft with a wooden mallet, press the 1st and 2nd speed synchronizer from the splines of the secondary shaft.
Remove the 1st and 2nd speed synchronizer from the secondary shaft from the lock. 2nd speed synchronizer washer.
Next, remove the ring that blocks 1st speed from the secondary shaft, then mark the synchronizer blocking washer in relation to the synchronizer clutch.
Remove the first speed gear.
Remove the locking ring.
Slightly release the lock of the 1st speed needle bearing and remove it by moving the latter along the length of the secondary shaft. Then mark the needle bearing.
Turn the secondary shaft over, using 2 large screwdrivers, press the inner bearing washer in front of the secondary shaft. Then remove the thrust washer.
Clean, rinse and dry the secondary shaft elements thoroughly. It's good to inspect them.
Check the condition of the shafts. If the bearings are worn, they need to be replaced. The shaft splines must be free of dents and all sorts of defects.
Check the position of the VAZ 2108 gearbox gear. In case of chipped teeth or any other damage, the gears need to be replaced.
Check the condition of the bearings and replace them if damaged.
The radial clearance of existing ball bearings should not exceed 0.05 millimeters. Check this method with an indicator.
Next, check the lock position. synchronizer rings. If there are nicks and all sorts of chips, they should be replaced.
Next, check the gap between the gears and the blocking rings. The smallest gap should be 0.6 millimeters. In case of smaller gap, block. the ring should be changed.
If there are burrs and dents on the thrust washers and retaining rings, be sure to replace them.
Assemble the secondary shaft in the same way as you removed it. Place the blocking rings with the marks marked earlier. Install new rings in such a way that they align with the grooves of the hub.
Press the ball bearing on the rear of the secondary shaft using the required mandrel, using extreme force, to the ring inside the bearing
After assembly, you should check the operation of the synchronizers. By moving their clutches manually to the proper speed engagement position.
In general, this is how the gearbox bearings of a VAZ car are removed.

Repair work

More often it happens when the owner repairs his car himself, and then, at best, takes it (or, at worst, tows it) to a service center to the technicians.

You can repair the gearbox of a VAZ-2109 car yourself, but only if you are confident in your abilities.

This work:

First of all, remove the device to be rebuilt from the car.
Get rid of dirt with simple diesel fuel and rags.
Remove the dipstick indicating the oil level.
Install the clutch housing in a vertical position by unscrewing the two nuts of the third bracket fastening on the clutch cable.
Remove the second cable bracket.
Unscrew the remaining fasteners from the back cover and remove it.
Get rid of the fifth gear fork bolt.
Secure the shafts so that they do not turn.
Unscrew the fastening of the primary and secondary shaft.
Remove the 5th gear and don't forget the synchronizer and fork from the output shaft, which also need to be removed.
Remove the support plate from the synchronizer and remove the fork from the clutch groove.
Then remove the gear with one ring.
Remove the bushing from the secondary shaft.
Remove the gear from the input shaft.
Unscrew the screws with a screwdriver and remove the thrust washer from the secondary shaft.
Remove the retaining rings from the shaft bearings.
Remove the fixing elements and carefully remove their balls.
Unscrew the rear inlet plug and remove the seal ring.
Remove the spring and then the ball, slightly tilting the product.
Remove the crankcase mounting nuts and bolts.
Separate the crankcases using a flathead screwdriver.
In the correct sequence, as shown in the photo, unscrew the bolts of the gear shift forks.
Lift the first gear rod until it comes out of the support. Turn it clockwise until the head comes out of the locking bracket clutch.
Remove the rod with the fork after turning the 3rd-4th gear rod.
Turn the 5th rod and remove it.
Remove the reverse gear shaft.
Move the reverse gear all the way, turn it 30-40o and remove the intermediate element.
Remove the input and output shaft.
Remove the differential from the housing.
Unscrew the bolts and remove the gear mechanism.
Take out the magnet.
Get rid of the fastening nut and remove the housing from the drive gear.
Remove the reverse switch.
Remove the secondary shaft bearing.
Remove the oil collector.
The input shaft bearing needs to be pressed out in order to be removed.
Install new front bearings into the clutch housing.
Slide the edge on the rod protective cover.
Dismantle the gear lever and remove the rod.
Replace the unsuitable hinge protection cover.
To replace the clutch, press out the seals.
Remove minor damage using sandpaper on both crankcases or replace them if necessary.
Check the bearing seats in the crankcases to see if they are worn out and replace if necessary. Do the same with the remaining elements.
Clean the magnet from wear particles; if it is not suitable for use, replace it.
Clean the sealant from the crankcase planes and reassemble the gearbox in the reverse order.

Lubricate all rubbing elements generously with oil and do not forget about installing the magnet.

After overhauling and replacing all worn-out elements, the gearbox's performance cannot be compared to its previous condition. You will instantly feel all the improvements in the operation of the mechanism.

Existing checkpoint rows

Gearbox rows VAZ 2108: 1 – 3.42, 2 – 2.11, 3 – 1.35, 4 – 0.96, 5 – 0.78, 6 – 0.69

They are also called “commercial” because for many years they were considered quite famous, as well as being sold in series. In general, this is true at the moment. The first speed is extended, the second and fourth are shortened. Any changes are minimal (five percent each), and this is enough to correct the shortcomings of the standard series. In most cases it is installed with GP 4.1. The good news is that it is within the normal range. Gives improved overclocking.

Gearbox for front-wheel drive VAZs

The first VAZs of the eighth model, which rolled off the assembly line back in 1984 of the last century. They were equipped with 2-shaft gearboxes, which were combined in 1 housing with a differential. Since those distant times, gearboxes have been updated in every possible way. But since some changes have occurred in the elements, they are not entirely interchangeable. The first VAZs of the eighth model were equipped with 4 VAZ 2108 gearboxes, as well as 5-range gearboxes without a dipstick.

At the moment there are practically none of these left. In 4-band, the main pairs were 4.1, also 3.9. In five-band 3.9, also 3.7. The concern decided not to indulge in a large selection and used only one main pair - 3.7. As for the gearbox ratios, they were, and still are, only one for all cars.

Tips for replacing the gearbox

Many drivers are in favor of changing the 4-range gearbox on the VAZ 2108 to a 5-range gearbox. Thus, the speed probability of the car increases, the acceleration dynamics are improved. However, the 4-range gearbox is already a thing of the past. And to modernize your car, a 5-speed gearbox is just right, and in some cases they even install a 6-speed gearbox, for which the same VAZ 2108 gearbox bearings are suitable.

What to choose

The design of the VAZ 2109 gearbox is imperfect, but this is not a good reason to change it completely. The design itself is reliable, it just requires some modifications. The best option is to replace the problematic part, which causes frequent unit breakdowns, or install new components.

If you need to change the gear ratios of your original transmission, replacing a pair of gears from 17-tooth to 15-tooth parts will do. This modernization increases the efficiency of acceleration, the transition time from gear to gear is reduced, but the maximum speed of the car decreases. Perfect for traveling in urban areas.
Installing sports gears makes the gears “longer”, that is, switching from one gear to another is required less often, while the dynamics of acceleration and maximum speed are practically not lost. This gearbox tuning is suitable for those who want to increase the speed characteristics of their nine. Mainly used after replacing the engine with a more powerful analogue.
You can try replacing the original secondary shaft of the nine. The problem with this part is that it is hollow inside. Due to dynamic loads on the assembly, it often happened that this particular shaft shattered into pieces, which led to the final breakdown of the entire gearbox due to fragments stuck in the teeth. Replacement is made with a solid analog shaft for a pair of gears with a gear ratio of 4.13.
Want to make your car more agile on the track? Buy additional sports hub bearings for tuning. They will slightly improve the performance of the chassis, but the main thing is that they are more reliable than factory parts.
Start adjusting the differential, but do it only in reputable auto repair shops and service stations. Incorrect adjustment of the part will lead to frequent breakdowns or loss of vehicle controllability.

There are a lot of tips and fairly detailed instructions on how to independently replace a part of an assembly or the entire assembly, but you don’t need to do this if you don’t know the architecture of the car. When carrying out many works, practice and clear knowledge of the matter are required, so it is better to entrust the work to the masters at the service station.

If you need to improve the gear shift mechanism of a VAZ 2109, then before modifying it you need to purchase some additional parts and replace the factory ones with them. This option for solving problems is the cheapest and simplest. Installing an automatic transmission on a VAZ 2109 is not always justified. This modification will simplify driving the car, slightly increase the working life of the unit and allow it to smoothly transition from one speed mode to another. On the other hand, not every owner of a nine can handle repairs, maintenance and installation of automation, so taking into account the costs, this solution is not effective.