final drive ratio

[mikep 0]

have a f/l e30 has a 2.5 motor and 5 speed what is the highes ratio poable to fit and the avalibilty of the diff and help would be nice please

[BM WORLD 1283]

i have a 3.64 medium case for a e30 325i . but i also have a 3.15 raito medium case e34 diff . you can remove teh gears and fit them to a e30 case .

also have 3.25 and 3.46 ratio's from old e28 etc same story.

[Silver Fox 43]

2.93 common E28 525e manual

3.07 common E28 525e auto

3.15 rare M3

3.23 rare 323

3.25 common E28 528i and later 525e

3.45 rare

3.46 common 323 325 320 auto's

3.63 common f/l 325

3.64 common M10 316 and 318

3.73 common f/l 325

3.74 rare

3.9 common M10 316 and 318 and M20 320's

4.10 common M40 318 auto's

4.27 common M40 manual

4.45 common M40 316 and 318 auto

the above are all open diffs, LSD's are another story.

the E28 diffs fit, you need to change the back plate and output shafts, 5 mins work.

A lot of cars have had diff changes, so you can find different ratios across the range now.

Look around the wreckers, including Pickapart, and Hellbm on here, and keep an eye on trademe, they turn up regularly. Should have known Brent would have some too.

Edited August 16, 2008 by Silver Fox