280i diff

[Robert ody]

Hi Gents

I want to change the diff oil on my 280i diff and would like a bit of advice my diff has got the ratio on a tag on the back of the diff but no other tag so i am assuming it is not a powerlok diff is it just normal EP gear oil in the diff is there any way of knowing if it is a normal diff or a powerlok Diff if there is no tag or were the 280i's not fitted with a powerlok diff any info would be appreciated

Rob

[pk500]

Robert ody said:

Hi Gents

I want to change the diff oil on my 280i diff and would like a bit of advice my diff has got the ratio on a tag on the back of the diff but no other tag so i am assuming it is not a powerlok diff is it just normal EP gear oil in the diff is there any way of knowing if it is a normal diff or a powerlok Diff if there is no tag or were the 280i's not fitted with a powerlok diff any info would be appreciated

Rob

Jack up the rear turn prop shaft if both wheel go the same way it's limited slip diff . If both wheel go in different directions it's not

[KKson]

pk500 said:

Jack up the rear turn prop shaft if both wheel go the same way it's limited slip diff . If both wheel go in different directions it's not

[RCK974X]

As far as I know, the 280 did not have a powerlok diff as standard, only the more powerful models had it.

If you have a 4 speed box, the OE ratio is 3.07 :1 Mine has a tag which says 3.068 on it. It's not very obvious, it's on one of the rear banjo case bolts.

I think the 5 speeders have 3.36 ? (somewhere around there anyway).

This all assumes it's original of course....

[Grady]

Long ago I had to replace the diff (broken pinion shaft) in my 82 XJ-6 and I went from the stock 3.0x to a LS 3.3x donated by a XJS. It was a little quicker per the seat of the pants but not dramatic. They were apparently the same size and so should swap into a TVR.

[RCK974X]

I'm pretty sure all the 4HU diffs are physically the same, and use same case and flanges etc. and are available from something like 4.4 through to 2.7 (?).

The powerlok has different internals/carrier but uses same actual gears and case.
(could be wrong on that, but don't think so)