TBH100040 | Crownwheel and pinion assembly - Defender, Discovery 1
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To check the stock of Genuine Parts before placing an order please use our Contact Us page
Land Rover Part Number: TBH100040 - Crownwheel and pinion assembly - 2-pin differential
TBH100040 is a crownwheel and pinion assembly for a 2-pin differential. Fitted to front and rear differentials on vehicles with the Land Rover-type rear axle, this assembly transfers rotational drive from the prop shaft to the axle shafts and establishes the vehicle's final drive relationship. The pinion accepts input from the drive shaft and meshes with the crownwheel to turn the axle carrier and wheels; correct tooth form and ring-pinion alignment are required for quiet running and long service life. Worn or damaged teeth produce noise, vibration and accelerated wear across gears and bearings. On applicable Defenders the assembly supports a 24-spline front axle configuration, and the same unit is used in rear axles built to the Land Rover-type specification. Replacement is typically performed when backlash or tooth damage falls outside service limits or when changing final drive ratio during axle rebuilds; when refitting, gear contact pattern and bearing pre-load must be set to the vehicle manufacturer's values to avoid premature wear or noise.
Use the compatibility data below to confirm fitment against your V.I.N.
Compatibility
- Defender (to 2006) - 24 spline front axle - From VIN 64L30973A
- Defender (to 2006) - rear axle - From VIN LA930456 (From VIN 42S41563)
- Defender - front axle - From VIN 7A000001 to VIN BA823579
- Defender 90 - rear axle - From VIN 7A000001 to VIN BA823579
- Discovery 1 - front axle - From VIN 71L55170A to VIN 71L99999A
- Discovery 1 - front axle - From VIN 72L40519A to VIN 72L99999A
- Discovery 1 - front axle - From VIN 73L10455A to VIN 73L99999A
- Discovery 1 - front axle - From VIN 74L06442A to VIN 74L99999A
- Discovery 1 - front axle - From VIN 75L20435A to VIN 75L99999A
- Discovery 1 - front axle - From VIN 76L06648A to VIN 76L99999A
- Discovery 1 - front axle - From VIN 77L14994A to VIN 77L99999A
- Discovery 1 - front axle - From VIN 78L61052A to VIN 78L99999A
Frequently Asked Questions
TBH100040 is the ring-and-pinion set that converts prop-shaft input into axle rotation and sets the final drive ratio in a 2-pin differential. The pinion meshes with the crownwheel to drive the axle carrier and wheels; damaged teeth or incorrect ring-pinion alignment cause noise, vibration and accelerated wear. Replacement is usually required when backlash or tooth damage exceeds service limits or when changing final drive ratio during an axle rebuild.
| Model | Variant |
|---|---|
| Land Rover Defender | 24 spline front axle - From VIN 64L30973A |
| Land Rover Defender | rear axle - From VIN LA930456 (From VIN 42S41563) |
| Land Rover Defender | front axle - From VIN 7A000001 to VIN BA823579 |
| Land Rover Defender 90 | rear axle - From VIN 7A000001 to VIN BA823579 |
| Land Rover Discovery 1 | front axle - From VIN 71L55170A to VIN 71L99999A |
| Land Rover Discovery 1 | front axle - From VIN 72L40519A to VIN 72L99999A |
| Land Rover Discovery 1 | front axle - From VIN 73L10455A to VIN 73L99999A |
| Land Rover Discovery 1 | front axle - From VIN 74L06442A to VIN 74L99999A |
| Land Rover Discovery 1 | front axle - From VIN 75L20435A to VIN 75L99999A |
| Land Rover Discovery 1 | front axle - From VIN 76L06648A to VIN 76L99999A |
| Land Rover Discovery 1 | front axle - From VIN 77L14994A to VIN 77L99999A |
| Land Rover Discovery 1 | front axle - From VIN 78L61052A to VIN 78L99999A |
If you are unsure of compatibility with your vehicle, you can also confirm by checking against your V.I.N. Simply reach out to us with your V.I.N and desired part number via our Contact page or use our Finding Part Numbers page.
Replace TBH100040 when backlash or tooth damage falls outside the vehicle manufacturer's service limits, or when changing final drive ratio during an axle rebuild. Always set gear contact pattern and bearing pre-load to the manufacturer's values when refitting to avoid premature wear or noise.
- C8 products are usually supplied by Britpart.
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