E30 Differential LSD

[Ted]

What are the different ratios for the E30 LSD diff. I have one here that looks like a 3:40

[straight6pwr]

where did you get this LSD? 3.40 is not a diff ratio, but the 3.46 is close. how did you determine that number, by the tag or by rotating the diff?

heres the best list i could compile:

e30 U.S. OE LSDs:

2.93

2.79

3.73

3.91

4.10

4.27

4.45

others (from other models/etc):

3.46

3.25

on an unrelated note, how much fun would a 4.45 diff be? torque monster!

[Ted]

Tag is rusted. Got it from rotating the diff. What models carry this diff.

[Earl]

4.45 LSD came from active sport TI's

I need an LSD. I have an open 4.45

I want a 4.10 or 4.27

[Ted]

I have a 4:10 LSD E30

[Ted]

Does any one know where a 3:45 LSD came from, which E30 models

[mystere30]

^^^ i dont know

but earl i do have a 4.10 LSD that came off a z3...or z4 if you want to buy it. just sitting on my parts car.

[Earl]

How much?

[straight6pwr]

the 3:46 diff didnt come with e30s. i think E24/E28s had them back in the day, and the newer ones from the z3/mcoupe are also compatible.

[Ted]

Therefore the diffs from the e24 and e28 are interchangeable with the E30. This one came out from a 1990 325is.

[straight6pwr]

and you are sure its a 3.46? was the e30 owned by someone who upgraded it in the past?

i couldnt say that all of the diffs from the e28 and e24 are compatible, i think some were large case and wouldnt work.

[Ted]

Yes, marked Input pinion and marked axel bearing to housing. And it lines up to around 3:40