Results 1 to 6 of 6

Thread: Large Case 210mm 3.91LSD 3.15LSD 3.45LSD and 3.64LSD Differentials E31 E34 E32

  1. #1
    Join Date
    Jun 2008
    Location
    SF Bay Area
    Posts
    3,778
    My Cars
    Supercharged 850ci

    Large Case 210mm 3.91LSD 3.15LSD 3.45LSD and 3.64LSD Differentials E31 E34 E32

    1) 3.91 LSD used, super low miles, looks new $1800 (shipped)
    2) 3.64 LSD fully rebuilt(bearings and seals) with an upgraded GKN Viscolok 7 disk LSD unit. $2100 (shipped)
    3) 3.45 LSD LSD fully rebuilt(bearings and seals) with an upgraded GKN Viscolok 7 disk LSD unit. $2200 (shipped)

    1) Large Case 3.91 LSD : Great upgrade for E34/E31/E32 8 and 12 cyl. cars, makes the car feel 500LB lighter, acceleration is greatly improved, biggest bang for the buck upgrade you can get...car comes alive!
    3.91 LSD was only offered in the US E-34 M5 up to 7/91,remaining years 92&93 used a 3.73 gear ratio.

    2) Large Case 3.15 LSD Upgrade for E31 850i 6 speed, E31 850ci 5 speed automatic, marginal upgrade for E31 840i 5 speed automatic and E34 540i manual.

    3) Large case 3.64 differential, great upgrade for 5 speed automatic E31 840i 840ci M73 850ci and some other BMWs

    4) Large case 3.45 differential, perfectly balanced upgrade for 5 speed automatic E31 840i 840ci M73 850ci keeps the highway RPM reasonable at about 3k at 80MPH.

    These differentials are a direct swap, all you need to do is swap the output flanges and the back cover, in some cases input flange.

    diff.jpg

  2. #2
    Join Date
    Nov 2006
    Location
    USA
    Posts
    1,134
    My Cars
    e34 540ia/e32 740il
    How much for the 210mm 3.15 LSD? Could you PM me some pics?

  3. #3
    Join Date
    Jun 2008
    Location
    SF Bay Area
    Posts
    3,778
    My Cars
    Supercharged 850ci
    Quote Originally Posted by m60power View Post
    How much for the 210mm 3.15 LSD? Could you PM me some pics?
    I am out of the 3.15 LSD units. But I can build a 3.45 LSD.

  4. #4
    Join Date
    Mar 2018
    Location
    Arizona
    Posts
    367
    My Cars
    1998 328I
    sent pm

  5. #5
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    712
    My Cars
    850,76 2002 &530,84 633
    Ed, I just dropped and disassembled the rear suspension on my '91 model this week. The flanges on the oem diff and the diff I bought from you appear to be the same so I dont think I will have to swap them. Flanges on both diffs also have same number on inside of flange is that means anything. Bolt pattern and inside diameter where CV dust cover fits are the same on both. I just need to clean up the rust and paint the LSD diff before I install it.
    IMG_20190213_155818112_HDR.jpg
    IMG_20190213_155855005.jpg

  6. #6
    Join Date
    Jun 2008
    Location
    SF Bay Area
    Posts
    3,778
    My Cars
    Supercharged 850ci
    Quote Originally Posted by JDP530 View Post
    Ed, I just dropped and disassembled the rear suspension on my '91 model this week. The flanges on the oem diff and the diff I bought from you appear to be the same so I dont think I will have to swap them. Flanges on both diffs also have same number on inside of flange is that means anything. Bolt pattern and inside diameter where CV dust cover fits are the same on both. I just need to clean up the rust and paint the LSD diff before I install it.
    IMG_20190213_155818112_HDR.jpg
    IMG_20190213_155855005.jpg
    Glad you are finally getting around to installing 3.91 lsd.
    The bolt thread pattern is different I believe from E34 M5 to E31 that's the reason for a flange swap. But this diff might already have e31 output flanges.

Similar Threads

  1. Replies: 21
    Last Post: 07-27-2020, 11:56 PM
  2. Replies: 8
    Last Post: 01-30-2020, 03:11 PM
  3. Large case (210mm) differentials
    By e36ALPINE in forum Forced Induction
    Replies: 5
    Last Post: 02-03-2015, 11:20 PM
  4. E31 M5 large case 210mm LSD differential SOLD
    By whiteghost1 in forum Parts for Sale
    Replies: 2
    Last Post: 07-03-2011, 02:28 PM
  5. E34 FS: M5 large case 210mm LSD differential
    By whiteghost1 in forum E34 Classifieds (closing soon)
    Replies: 5
    Last Post: 04-06-2011, 01:54 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •