Which diff should I use?

[toddy11143]

I thought I'd posted this but can't see it!

I've just come into possession of 2 complete rear
suspension assemblies, both with 2.88 diffs, and would like to
fit one of them to my 1969 4.2 FHC.

One has an alloy, ribbed rear cover plate and a small hose in
a plastic sheathing going to each hub, which I suspect may be
for ABS (the assembly is probably ex-XJS?). It bears a rather
soiled plate saying ''Genuine Jaguar Replacement'').


The Other diff has a steel cover plate like that fitted to the
car at the moment.

I would like to fit one of these to the car to lower engine
revs. Provided that they are in a similar condition, my question is
which one should I use?

Many thanks,
John
'69 FHC
'70 OTS

[mgcjag]

Hi John....i saw this posted a few days ago but then it disapeared...sorry cant advise on which to use....but assume your fhc has a LSD.....are the others you have also LSD

[288gto]

In the absence of a "PL"tab (Power Lok) on the diff back cover and to be sure, if it is a limited slip diff the simple test is to turn one of the output shafts. If the other output shaft turns in the same direction you have a limited slip diff. If it turns in the opposite direction you don't.

Simon.

[toddy11143]

Thanks 288GTO and mgcjag. I'll check that they are both LSD. If they are, is the alloy finned diff any better than the other?

John
'69 FHC
'70 OTS