# FS: 3.91 lsd bmw rear diff LSD **URL:** \ **Category:** Classifieds\ **Created:** [April 6, 2009, 11:11pm UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755 "2009-04-06T23:11:16Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![turbociv](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@turbociv](https://forums.speedlife.net/u/turbociv)\ **Post date:** [April 6, 2009, 11:11pm UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/1 "2009-04-06T23:11:16Z")
sold ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [April 7, 2009, 10:58am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/2 "2009-04-07T10:58:05Z")
Humm I wonder how this would be in my auto M3… let me see what is in my and I’ll get back to you. Make fenski buy this from you. ---
**Author:** ![turbociv](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@turbociv](https://forums.speedlife.net/u/turbociv)\ **Post date:** [April 7, 2009, 11:31am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/3 "2009-04-07T11:31:42Z")
> [@ultradriver10000](#): > > Humm I wonder how this would be in my auto M3… let me see what is in my and I’ll get back to you. Make fenski buy this from you. lol, someone should buy it. Made my Stock BMW ALOT faster with this mod. ---
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [April 7, 2009, 11:43am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/4 "2009-04-07T11:43:09Z")
this is the perfect upgrade for ultra because you’re only going from a 3.4 (auto M3 I think) to a 3.9 which is not too aggressive for you, but a little much for most daily drivers. AND you can make money on this deal because your 3.4 is considered VERY desirable to manual M3 owners who want to upgrade from their stock 3.23, but don’t want to sit a 4k+ on the highway. ---
**Author:** ![Johnnyv412](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/johnnyv412/32/5226_2.png) [@Johnnyv412](https://forums.speedlife.net/u/Johnnyv412)\ **Post date:** [April 7, 2009, 12:26pm UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/5 "2009-04-07T12:26:49Z")
175 picked up? 🙂 ---
**Author:** ![turbociv](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@turbociv](https://forums.speedlife.net/u/turbociv)\ **Post date:** [April 7, 2009, 10:02pm UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/6 "2009-04-07T22:02:06Z")
> [@Johnnyv412](#): > > 175 picked up? 🙂 200 delivered?😃 ---
**Author:** ![frost12850](https://avatars.discourse-cdn.com/v4/letter/f/2acd7d/32.png) [@frost12850](https://forums.speedlife.net/u/frost12850)\ **Post date:** [April 8, 2009, 5:08am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/7 "2009-04-08T05:08:53Z")
> [@ultradriver10000](#): > > Humm I wonder how this would be in my auto M3… let me see what is in my and I’ll get back to you. Make fenski buy this from you. You buy this one and Ill buy yours off you :naughty:… yea, Ive actually thought about this for a little bit John, not sure if Id enjoy the highway RPM’s… ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [April 8, 2009, 6:24am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/8 "2009-04-08T06:24:10Z")
> [@theblue](#): > > this is the perfect upgrade for ultra because you’re only going from a 3.4 (auto M3 I think) to a 3.9 which is not too aggressive for you, but a little much for most daily drivers. > > AND you can make money on this deal because your 3.4 is considered VERY desirable to manual M3 owners who want to upgrade from their stock 3.23, but don’t want to sit a 4k+ on the highway. Humm if mine is really a 3.4 maybe I will buy this! 🙂 John how is the posi in this unit, you know I like my burnouts hairy, with both wheels spinning. ---
**Author:** ![frost12850](https://avatars.discourse-cdn.com/v4/letter/f/2acd7d/32.png) [@frost12850](https://forums.speedlife.net/u/frost12850)\ **Post date:** [April 8, 2009, 6:57am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/9 "2009-04-08T06:57:10Z")
> [@ultradriver10000](#): > > Humm if mine is really a 3.4 maybe I will buy this! 🙂 > > John how is the posi in this unit, you know I like my burnouts hairy, with both wheels spinning. Do it, I want your Diff. But Im not sure, I think I remember looking at this and it may be a 4 bolt diff… Im not sure how all that works with 4 bolt versus 6 bolt ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [April 8, 2009, 7:23am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/10 "2009-04-08T07:23:42Z")
> [@frost12850](#): > > Do it, I want your Diff. But Im not sure, I think I remember looking at this and it may be a 4 bolt diff… Im not sure how all that works with 4 bolt versus 6 bolt Awh you’d have to swap everything out. ☹ ---
**Author:** ![frost12850](https://avatars.discourse-cdn.com/v4/letter/f/2acd7d/32.png) [@frost12850](https://forums.speedlife.net/u/frost12850)\ **Post date:** [April 8, 2009, 7:24am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/11 "2009-04-08T07:24:39Z")
> [@ultradriver10000](#): > > Awh you’d have to swap everything out. ☹ Well youd be better off checking with John on this… ---
**Author:** ![Paulo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/paulo/32/7328_2.png) [@Paulo](https://forums.speedlife.net/u/Paulo)\ **Post date:** [April 8, 2009, 8:11am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/12 "2009-04-08T08:11:21Z")
Must…not…mod…DD. Ugh ---
**Author:** ![turbociv](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@turbociv](https://forums.speedlife.net/u/turbociv)\ **Post date:** [April 8, 2009, 8:21am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/13 "2009-04-08T08:21:20Z")
yes, im sorry i forgot to mention guys. Its a 4bolt and yes the lsd works great. plenty of harry burnouts left in her.😃 You could always just swap the flanges or find another flange to swap on to it. ---
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [April 8, 2009, 9:18am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/14 "2009-04-08T09:18:20Z")
for all of the above: you can swap your current output shafts from your current diff in about 5 mins with any of these if they have a different number of bolts… they just pull right out. my E30 has a 3.94 (I believe) and I would not want to daily this ratio - it’s insane, but I love it on my FUN car. for automatic BMWs it’s a different story, they can daily this. ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [April 8, 2009, 10:08am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/15 "2009-04-08T10:08:06Z")
Well if that is the case I’ll prolly take it as long as Matt will pick it up and drop it off at Derrick so I can get free shipping out there to Houston. Stupid M3 DD lol ---
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [April 8, 2009, 10:28am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/16 "2009-04-08T10:28:10Z")
and look at the finished ebay prices for you current diff, they sometimes go for \>$500. ---
**Author:** ![frost12850](https://avatars.discourse-cdn.com/v4/letter/f/2acd7d/32.png) [@frost12850](https://forums.speedlife.net/u/frost12850)\ **Post date:** [April 8, 2009, 11:13am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/17 "2009-04-08T11:13:58Z")
> [@ultradriver10000](#): > > Well if that is the case I’ll prolly take it as long as Matt will pick it up and drop it off at Derrick so I can get free shipping out there to Houston. > > Stupid M3 DD lol I got you covered buddy, you should already know that. ---
**Author:** ![snowracer101](https://avatars.discourse-cdn.com/v4/letter/s/258eb7/32.png) [@snowracer101](https://forums.speedlife.net/u/snowracer101)\ **Post date:** [April 8, 2009, 11:26am UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/18 "2009-04-08T11:26:45Z")
sold yet? this would be great for my M ---
**Author:** ![turbociv](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@turbociv](https://forums.speedlife.net/u/turbociv)\ **Post date:** [April 8, 2009, 9:12pm UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/19 "2009-04-08T21:12:37Z")
Not sold yet. someone buy this please. its taking up space next to teh spare tranny/ wheels and other shit i got laying around. ---
**Author:** ![turbociv](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@turbociv](https://forums.speedlife.net/u/turbociv)\ **Post date:** [April 8, 2009, 10:53pm UTC](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755/20 "2009-04-08T22:53:39Z")
> [@ultradriver10000](#): > > Well if that is the case I’ll prolly take it as long as Matt will pick it up and drop it off at Derrick so I can get free shipping out there to Houston. > > Stupid M3 DD lol i go out to lunch with newman quite often, im sure i can give it to him as well. let me know.🙂 [Next page](https://forums.speedlife.net/t/fs-3-91-lsd-bmw-rear-diff-lsd/65755.md?page=2)