Which defender gearbox

Posted January 15, Thanks much. Join the conversation You can post now and register later. Reply to this topic Insert image from URL. Go to topic listing. Sign In Sign Up. Important Information We use cookies to ensure you get the best experience. Accessories for your Land Rover or Range Rover. Products of Shipping Schedule:. Fits: Defender 90 - Tdi, 2.

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Share this on Twitter Share this on Facebook Email. Continue Reading 1 Overview. Engine, gearbox and technical highlights - currently reading. Performance and time. Ride and handling. Some owners still prefer to have a centre diff lock which can be retrofitted on the grounds that it gives a little more driver control and ability in some more extreme off-road situations. The earliest Discovery 2 models still had the diff lock mechanism fitted but no lever, and a kit is available to install the lever and linkage to operate the existing mechanism.

This applies to transfer boxes with serial numbers prefixed 41D and 42D. You can check by feeling the top of the transfer box front housing. For subsequent vehicles that do not have the mechanism nor the lever diff lock was available as an option when new , Ashcroft Transmissions produce a kit, which includes a new front housing and the necessary parts and seals.

This applies to transfer boxes with serial numbers prefixed 61, 62, 69 and 70D. If the diff lock mechanism is fitted, you can see or feel the threaded stud rising from the top of the front housing foreground. Ashcroft Transmissions supply this centre diff lock kit including a new front housing. A lever will be needed too.

The following parts are available from Ashcroft Transmissions ashcroft-transmissions. The steering feels tighter, with more ground effect and feedback. This is a normal effect of driving with diff lock engaged, especially when reaching firmer ground where the tyres are less able to slip to release transmission wind-up.

If so, it may be appropriate to come out of diff lock, to reduce the stress on the transmission. The lever moves to select diff lock, but diff lock does not engage and the light does not come on. The linkages may be stiff or seized due to lack of use. If so, it is possible, though fiddly, to clean and lubricate some of the linkage underneath the vehicle and to work the lever for a while to free it off.

Otherwise, with the transmission floor cover removed for access, check the lock nut holding the operating arm to the pivot shaft is tight, and that the arm is correctly located on the shaft. You can feel the steering pull associated with diff lock, and the warning lamp is on, even though the lever has been moved. This is a normal feature of the four-wheel drive system. Otherwise, the internal linkage will need to be checked by lifting the transmission cowl to gain access.

The switch for the difflock warning lamp, on top of the transfer box front housing, may be incorrectly adjusted, and need screwing out slightly. Diff lock warning switch is positioned on top of the unit, seen here from the side with cover plate removed, exposing selector mechanism.

The transfer box flange to the front propshaft can be moved up and down slightly. Slight movement can be expected here because there is always slight clearance in the parallel roller bearings supporting this flange, so it is unlikely to need attention. If movement is excessive, or there is an obvious problem, the bearing will need replacement. If an output flange is grooved here from oil seal contact, fit a new flange, or the grooving will damage the new oil seal.

Heard generally from the transmission area. The simplest way is to ask a garage to run the transmission on a wheels-free lift while listening underneath for the source of the noise. If the transfer box is the culprit, the wear is likely to be in the front or rear output bearings, or both.

No traction unless diff lock is selected. Expect an axle problem such as a broken halfshaft.