Diff

[calex]

Found a diff in the scrapyard 3.46 will this be any use for my 325 m20? Cheers.

[Speedtouch]

Probably, if it is a medium case one.

http://www.e30zone.net/e30zonewiki/inde ... fferential

[calex]

It's looks exact same as came out.

[Speedtouch]

In that case, it should be fine. What do you currently have, 3.64 or 3.91?

[calex]

Not sure the tags missing and it was on the car when I got it, it was an lsd but the gears are in about 10 bits now.

[Speedtouch]

Most 325i Sport LSDs were 3.91:1, and a bit low-geared tbh.

[Brianmoooore]

3.46 is an excellent choice of ratio for a M20B25, but if it' replacing a 3.91 you'll notice both a difference in acceleration (bad) and in your wallet (good).

[calex]

yeh i put the diff on yesterday and it perfect for that car. The only difference i noticed is in 5th the revs are at 2500rpm at 70mph, the last diff was about 3100rpm so it cruises nicer and bound to be better on fuel on a long run.

[Andyboy]

That's a rare diff and it would have come from a 323i. A very similar 3.46 diff is fitted to 24v E34 520i's. Swap the rear cover and flanges and it swaps straight over.

[bss325i]

The 320iS also used a 3.46.