Gearbox JH3, JR5, 21809 — design description

Depending on the configuration, five-speed gearboxes Renault JH3 and JR5, as well as VAZ-21809 are installed on the car (since 2018), made according to a two-shaft scheme with synchronizers for all forward gears and combined with a differential and final drive. The gearbox is filled with transmission fluid at the factory, which is designed for the entire life of the car. Therefore, it is not necessary to change the oil in the gearbox according to the terms of maintenance.

JH3 gearbox

The car engine, like all internal combustion engines, develops power and torque in a relatively narrow rev range. As the engine speed decreases, the power decreases.


The power train allows you to reduce the number of revolutions of the drive axle in relation to the number of revolutions of the engine crankshaft, increasing tractive effort. The higher the traction force, the lower the speed.

When driving a car, it becomes necessary to apply different speeds and different traction forces. So, for example, when driving on deep sand, the speed is negligible, and to overcome the resistance of the road, a rather large traction force is needed. High tractive effort is also required when starting the vehicle and overcoming steep inclines. On the contrary, when driving on a paved road, little tractive effort is needed, and the driving speed can be high.

To increase or decrease the traction force on the drive axle with a constant torque on the engine shaft, a gearbox is used in the vehicle's power transmission.

Due to the fact that the engines of different car models have different power, then, of course, the gear ratios of individual gears, and, consequently, the number of teeth of the gears are different. However, the principle of operation of gearboxes is the same, and the operations for disassembly, assembly and repair are generally similar.

The purpose of the gearbox is to provide further transformation of torque in magnitude and direction in accordance with the load on the car, as well as to allow the engine to idle.

The basic principle of operation of the gearbox is the same everywhere, the essence of which is the pairwise connection of gears that have a different number of teeth. In this case, the torque transmitted by the gears changes in proportion to the gear ratio, i.e. the ratio of the net teeth of the driven gear to the number of teeth of the drive gear.


The gearbox is, in principle, a very simple device.





The rod is attached at one end to the bushing of the gearbox control mechanism, and at the other end to the shift mechanism installed on the gearbox.

Gearbox JR5

Gearbox control mechanism: 1 - gear selection cable; 2 - gear shift cable; 3 - control mechanism; 4 - gear lever; 5 - a cover of the gear lever; 6 - gear lever handle

Checkpoint VAZ-21809

Redesigned gearbox manufactured by VAZ with a cable shift drive. It has been installed on Lada Largus instead of the JR5 gearbox since 2018, paired with a 16-valve VAZ-21129 engine. Together with foreign engineers, a number of improvements were made on the box in order to reduce vibration noise, incl. gear tooth profile has been changed. Improved clarity and balance of gear shifting.

Gear ratio tables for LADA Largus gearbox

Note. gear ratios on vehicles with AvtoVAZ engines differ from those presented.

	5 places with K7M	7 seats with K7M	5 and 7 seats with K4M	Van with K7M and K4M
Transmission	JH3 540	JR5 551	JR5 549	JR5 517
1st gear	3,727	3,727	3,727	3,727
2nd gear	2,048	2,048	2,048	2,048
Gia transfer	1,393	1,321	1,393	1,321
4th gear	1,029	0,971	1,097	0,971
baya transfer	0,82	0,795	0,892	0,738
Reverse gear	3,545	3,545	3,545	3,545
Main couple	4,214	4,5	4,214	4,928

Gear ratios of the gearbox VAZ-21809

l	3,636
II	1,952
III	1,357
IV	0,941
V	0,784
Reverse	3,500
Final drive	3,944

Factory designations and fifth gear parameters

Gear ratio	Input shaft gear		Output shaft gear
	Number of teeth	Part number	Number of teeth	Part number
0,892	37	8200611295	33	8200608035
0,820	39	8200611299	32	8200607980
0,795	39	8200611297	31	8200607978
0,756	41	8200611301	31	8200607981
0,738	42	8200611303	31	8200607983

Mass of gearboxes (gearbox weight in kilograms)

• JH3 - 33.0 kg
• JR5 - 34.0 kg
• 21809 - 31.8 kg

Checkpoint identification

Determining the installed gearbox by configuration and engine (only for motor Renault).

Body and engine	station wagon 5 places with K7M	station wagon 7 seats with K7M	station wagon 5 and 7 seats with K4M	Van with K7M and K4M
Installed checkpoint	JH3 540	JR5 551	JR5 549	JR5 517

In more detail, the ratio of engines and gearboxes is indicated Here.

Note. To accurately identify the installed gearbox, see its marking (see below).

Plate 1, Figure 2-1, punched into the gearbox housing, provides information about the gearbox, Figure 2-2.





The markings on the gearboxes are applied from below, on the crankcase.

The gearbox code is located on a sticker on the back of the black gearbox cover (on the left in the direction of travel). Although it is difficult to see her on a car, you can:

Differences in the designation of the KP

Production AVTOVAZ

External supply