Author Topic: What diff do you think this is? (Read 2522 times)

david220 · « **on:** May 01, 2007, 05:01:31 AM »

Ran across this, supposed to be out of a late '80s e30; has an 'S' stamped in white on the top along with a '54' ; looks like two serial numbers which could be just case part #'s one is 66640 and the other looks to be 1210311 which could be the case BMW part #. The fellow said it was a 4:10 LSD. I am thinking about putting it in my '91 318is; the lower front mounting needs rethreading but other than that seems fine. Thoughts? Looks a bit larger in the rear than the one I took out, so I do not know if it will clear the sway bar. David

jpod999 · « **Reply #1 on:** May 01, 2007, 06:57:25 AM »

There should be a little metal plate on the back of it with a number stamped into it. If it is a 4.10 LSD then it would say S4.10. If it is open then it would just say 4.10. That goes for all the other gearing ratios too.

david220 · « **Reply #2 on:** May 03, 2007, 05:07:29 AM »

It is a 4.10, rethreaded and bolted up; I am going to clean up and go through the old one, shouldn't hurt to have an extra.

david220 · « **Reply #3 on:** May 03, 2007, 07:52:04 PM »

Finished installing the LSD and got the rear springs and shocks done, took it out for a short run to settle things in and there is a noticeable difference with the 4.10. I need to do the front springs and shocks before getting over 3rd so I do not know what happens on the highway. It is a good swap to do for sure. David

nickmpower · « **Reply #4 on:** May 03, 2007, 08:33:17 PM »

stock is 4.1

jpod999 · « **Reply #5 on:** May 03, 2007, 11:34:15 PM »

What ^^ said. If you didn't have a 4.10 LSD before, then you probably had a 4.10 Open.

david220 · « **Reply #6 on:** May 04, 2007, 05:00:24 AM »

Yes, I did not have LSD before.

Donkeyshins · « **Reply #7 on:** May 04, 2007, 01:27:16 PM »

Quote from: david220;25133

Yes, I did not have LSD before.

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