Stock LSD on 1990 535i

[chris_e34]

Can anyone tell me the stock lsd in a automatic 1990 535i??? im at work and i cannot crawl under my car to check. thanks

[Karyn]

Looking at Real OEM, it appears that the auto e34's had a 3.91:1 ratio.
Karyn
http://www.realoem.com/bmw/showparts...04&hg=33&fg=05

[hakwuzhere]

Not to derail... but does this mean my Diff is 25% non LSD, 3.23:1 ratio? And what type of diff would I upgrade to to get slightly better off the line, but not sacrifice gas milage too much...

[Jeff N.]

There early autos had a 3.91 and the later autos had a 4.27 if I recall correctly. 90 is close to the cutoff point; you'd likely need the VIN number to determine production date to see which one you have.

LSD was an option in both cases. I don't recall if the VIN will tell you if you have an LSD or not. There's a tag on the unit itself; if there's an S on the tag it's a limited slip.

[Paul in NZ]

the manuals were 3 46 or 3 64...i think the "sports" had the 3 .64