Leaking rear axle shaft seals can be withdrawn after releasing the suspension arms, allowing the shafts to be withdrawn. Replacement of the differentials pinion bearing and oil seal is a relatively involved job, and is not a basic DIY prospect.
The differential mountings can be changed with the diff in position, though it’s very tricky. To replace all three it’s worth disconnecting the suspension to withdraw the half shafts so the differential can be manoeuvred to improve access for the mountings. Ensure the diff is accurately aligned with the drive train when bolting up. Retighten suspension links with the vehicle’s weight on the suspension.
If the rear drive train starts giving trouble and you can’t get to garage, or the garage can’t do the work for a couple of weeks, you won’t want to risk expensive damage by driving on. So, remove the complete assemble of front and rear prop shaft and VCU. You can then use the car in two wheel drive with far less load on the differential and IRD, and with no chance of damaging other parts of the transmission.
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