Hi all

I'm going to change the diff ratio on my e34 535 manual and was wondering weather any ones got any part numbers so that i can check the diff that i'm buying second hand is the correct ratio.

I'm thinking of changing from the standard 3.46 to a 3.73 or 3.91.I don't do a lot of motorway miles so the higher revs in 5th don't bother me that much,but i want it to accellerate better.It's to long geared at the moment.I can get 120 mph in 4th and 110 mph in 5th @ 4000rpm.

3.73 is APX 8 % change in ratio from standard
3.91 is APX 13% change in ratio from standard

Has any one tried either ratio on there 535im ?

I'm leaning towards the 3.91 as a local scrap yard has an open(non-LSD) diff from a e34 535 auto for £ 95.

Thank's

Andrew