what size nut on early model drive shaft?

[mr.vang]

what size nut is it on the end of the drive shaft where it connect to the differential? i'm trying to get a S3.73 out of a 87 325is. so far i try 17mm and its seem too loose and 16mm is too small. usually 17mm fit like a charm.

[accident]

Is the nut rounded?

[MR 325]

17mm is the correct size.

[mr.vang]

Is the nut rounded?

nope, it look exactly like the original 17mm nut.

[Eddie Haskell]

I noticed this on my OEM DS/Diff.

I used a 21/32 I had from some lathe tooling.

A 1 1/4" open end will work on a fan nut, sometimes it needs a little grinding for thinness.

A Mapp torch or O2/Acy heat is your friend on those along with Kroil if they are virgins.

http://www.vaughns-1-pagers.com/science/wrench-conversion.htm

[stamar]

17 mm on all e30s except m3s and some etas.