Who knows about differentials?

[Ferret]

From what I can make out of E34.de, some of the 525i's were also fitted with 3.73 and 4.10 diffs depending on the gearbox, have you actually checked what yours is fitted with?

Will any E30 boxes actually mate up properly with the M50 engine?

I'd have a crawl under and look at its ratio tag, if it had an older auto box in it I'll bet it's got one of the horrifically high ratio diffs in it... I bet if you drop the 3.45 in it you'll notice an improvement!

[Ferret]

Doing some further research on bimmerfans.info and plugging in the fact it's a japanese vehicle, it gives me the choice of diffs:

3.91
4.1 (Not sure if this ones allowed)
4.44

Bet I know which one you've got...

[genphreak]

Doing some further research on bimmerfans.info and plugging in the fact it's a japanese vehicle, it gives me the choice of diffs:

3.91
4.1 (Not sure if this ones allowed)
4.44

Bet I know which one you've got...

Thanks Ferret, das good. If it was a Japanese vehicle I'd understand the low gearing. Will take a look and see. If it is as tall as this, the 3.45 might be a good substitute.

Anyone know hte best place to get a seal kit- BMA? Do we replace any bearings too? I've got a shop and a great friend who knows how... (I've never pried a diff apart before)