FS: E34/E31 Large Case 210mm 3.91 LSD Diff

[wilourosen]

Pulled from a 1991 M5 early production with just over 100k miles on it. Works perfectly.
Price is $1000 picked up in NYC. Might be convinced to ship it.

Feeler: I also have a set of squared M Systems 8X17 ET10 wit star covers included.
PM for more info

[dragon850]

Pretty good deal, have you tested the brake away? I found that the gears on 210mm are pretty much indestructible but LSD clutches and dog ears do wear quite a bit and need to be replaced on higher mileage diffs.

[wilourosen]

i have not tried it myself, i bought the diff from a friend who had it on his 1995 540i/6 and he said it ran flawlessly. I trust him, bought many parts from him in the past and never had an issue.

[seee31]

Dragon850 I've been following quiet a few of your post on diff swaps they have been very informative, but I do have a question is there anyway to tell if the LSD clutches and dog ears need to be replaced when purchasing?

Thanks!

[dragon850]

Dragon850 I've been following quiet a few of your post on diff swaps they have been very informative, but I do have a question is there anyway to tell if the LSD clutches and dog ears need to be replaced when purchasing?

Thanks!

Yes, basically you need to test break away on the LSD. Simplest way of doing that is when the car is up in the air and wheels are free twist the wheels in different directions and see how much force it takes to brake them loose, worn internals it will be quite easy. On the diff that's out of the car not that simple...

[BMWM5LOVER]

PM'd
Thank you.

[dragon850]

BTW this thread was never closed out by the seller.
He no longer has the diff, it is sold.

[seee31]

Thanks, but the diff is out of the car.