Hi, just need a bit of help.

I've had a ford 3.38 limited slip diff reconditioned, and I've been using comma diff oil, but think it's slipping too much when it's under load and hot.

What's the best diff oil to use for these?

Cheers

a sierra one ?

if its a sierra one it has a viscus LSD and is not affected by the oil (its a sealed unit inside the diff) so you only need EP90 GL5 diff oil



[Edited on 4/2/2011 by mcerd1]

Thanks. It was a sierra one, but from memory I can t remember seeing a sealed unit inside??

Anyway. Thanks for that.

its kind of hidden in the middle of the crownwheel (trying to find a decent pic just now....)

if its got a plate type LSD then its not a stock ford LSD

[Edit] Inside a Ford LSD:


when you look from the other side / back of the crown wheel the LSD ones are a bit 'fatter' in the middle also they have unequal length on the output shafts (the open ones are equal)

otherwise they look much the same inside as the open centre ones

[Edited on 4/2/2011 by mcerd1]

Perfect thanks a lot. That's the badger, so I guess the comma oil will make no difference to the slip properties.

there is a test procedure in the haynes books (V6 sierra one) as the LSD units can loosen off when they get old

this guy does exchange viscous units and 'tunes' then for you (not actually used him myself though)
http://www.gearboxman.co.uk/psdiffsgearboxman.html



[Edited on 4/2/2011 by mcerd1]

[Edited on 4/2/2011 by mcerd1]

just for reference her's a similar view of a 7" open diff:



spot the difference