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Rear Diff care

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Re: Rear Diff care

Postby Starbuck » Sun May 27, 2018 4:14 am

Hi Oliver,

Just a quick note on your comment about transmission fluid. GM recommend using Dexron-VI in all GM4L80e transmissions (the XJ81 transmission) as it is backwards compatible with Dex-III and is a much more stable fluid that drastically increases the life of clutch plates.

You can't use Dex-II in a transmission designed for Dex-III, but in many cases you are much better off using a newer oil or transmission fluid providing you check first to make sure it is backwards compatible. As with all things oils and fluids used in cars are continually being improved.


'94 XJ12 (and other toys)

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Location: Fareham, Hampshire, UK

Re: Rear Diff care

Postby moglite » Thu May 31, 2018 11:08 am

XJ4081 wrote:Great. Do you perhaps also have the exact filling capacity at hand so I can order the right number of cans?

Are there any differences concerning the accessibilty of the diff between XJ6 and XJ12? Otherwise it sounds pretty DIYable, let the old fluid come out by the lower drain bolt and refill via upper bolt through trunk. On the other hand - if it was so easy, why did every mech I asked to do it run away :? ?

Undo the filler first - if it is stuck, and you've drained the oil - you are in a world of pain :roll:

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Re: Rear Diff care

Postby XJ4081 » Wed Jun 06, 2018 12:24 pm

Is it possible to refill the diff without accessing The upper inlet through The Boot? E.g. From below on a lift?

The reason why I am asking is that the Garage where it was now claims to have refilled it. But I have already checked the cap in the boot, it still looks like it has never been touched since it was fitted in factory.
1993 XJ12

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Re: Rear Diff care

Postby pimgmx » Wed Jun 06, 2018 12:55 pm

Short answer: yes.

Especially if they weren't aware of the boot lid access they most likely will have done it the 'classic way' and put it on a lift and done it from underneath.

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Re: Rear Diff care

Postby XJ4081 » Wed Jun 06, 2018 2:30 pm

Hmm, ok. Nevertheless I have the feeling that they want to fleece me. How could they know how much fluid was missing without completely removing it - and if they did, why didn't they completely exchange it instead of just filling it up?

BTW: My diff is totally dry and rusty on the outside - no signs of leakage.
1993 XJ12

Chris Barney
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Re: Rear Diff care

Postby Chris Barney » Fri Jun 08, 2018 10:22 pm

Boot lid access??
My garage always tops up mine from underneath via plug.
Will my 88 3.6 have boot lid access?
88 Sovereign 3.6 Auto vin 556271
2010 Q5 2.0 TDI SE
2008 A4 1.8T S Line (DSG)

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