FTC3703 | Mainshaft Kit - R380 5-speed, Defender, Range Rover Classic
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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: FTC3703 - Mainshaft Kit
FTC3703 is a Mainshaft Kit for the R380 5-speed manual transmission. Fitted into the gearbox, the mainshaft supports the gear cluster and transmits drive through the selected gearsets; replacement restores correct gear mesh geometry and shaft runout to factory tolerances. Shaft wear is commonly visible on splines and bearing seats and can cause gear noise, gears jumping out of engagement, excessive endfloat and premature bearing wear. Renewal of the mainshaft is a core transmission repair when those wear modes affect shifting quality or bearing preload; during installation check bearing condition, end float and selector mechanism clearances and follow the vehicle-specific assembly procedures. Use the compatibility data below to confirm fitment against your V.I.N.
Compatibility
- Defender (1987-2006)
- Range Rover Classic (1992-1994) - From VIN JA610294
Frequently Asked Questions
The mainshaft is the primary longitudinal shaft in the R380 gearbox that carries the gear cluster and transmits torque from the input shaft to the output. Worn splines or bearing seats commonly cause gear noise, gears jumping out of engagement and excessive endfloat; replacing the mainshaft restores correct mesh geometry and shaft runout. During refit, check bearing condition, end float and selector clearances and follow vehicle-specific assembly procedures to prevent recurrence.
| Model | Variant |
|---|---|
| Land Rover Defender (1987-2006) | Mainshaft (5 Speed Manual Transmission) |
| Land Rover Range Rover Classic (1992-1994) | Mainshaft (Manual Transmission) - From VIN JA610294 |
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 the mainshaft when splines or bearing seats show wear, or if there are symptoms such as gear noise, gears jumping out or excessive endfloat; it is also commonly renewed during a gearbox overhaul. Always inspect bearings, end float and the selector mechanism during transmission service and follow the vehicle manufacturer's procedures.
- C8 products are usually supplied by Britpart.
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