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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Mar-07-2017, 08:48:26 PM   #1
thirtysixnick
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Default 3.23 LSD to 3.15 LSD?

Okay first; Yes I know it would be a "downgrade" to some standards, but that's beside my question right now + my 3.23 diff is DEFINITELY shot.

My question is, would swapping a 3.15 M3 LSD that is out of a 95 work when swapping out my 97 M3/4/5's 3.23?

The guy who has the 3.15 is willing to install it for me and today we hopped into removing the diff and it looks like both out flanges are 6 bolt, but the little sheathe from my 3.23 that goes in between the bolts (I think there's three of them, because it fits two bolts in each) doesn't seem to link up with the 3.15 bolt distance???

Does the 3.15 LSD have a different bolt distance than my sedan's 3.23's output flange?

If the output flanges bolts are different in spacing is it possible to swap it from my 3.23 without a huge hassle?

I appreciate ANY feedback as I have to have my car out of the shop by the end of the week more than likely so I'm somewhat pressed to make this work haha.
Sorry for no photos. I'll look around and see if I can find some pictures online or something to explain this issue.
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Old Tue, Mar-07-2017, 10:06:19 PM   #2
jayjaya29
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Default Re: 3.23 LSD to 3.15 LSD?

You can easily swap the flanges. They pop right out with a prybar.
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Old Tue, Mar-07-2017, 10:13:18 PM   #3
M-technik-3
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Default Re: 3.23 LSD to 3.15 LSD?

you have a sedan and he has a coupe, which are different driveshaft lengths. DUH was was thinking automatic with the 3.38 comment. insert foot in mouth.

Last edited by M-technik-3; Tue, Mar-07-2017 at 10:26:08 PM.
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Old Tue, Mar-07-2017, 10:57:54 PM   #4
Braymond141
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Default Re: 3.23 LSD to 3.15 LSD?

Quote:
Originally Posted by M-technik-3 View Post
you have a sedan and he has a coupe, which are different driveshaft lengths. DUH was was thinking automatic with the 3.38 comment. insert foot in mouth.
Chassis does not determine driveline length. Coupe, Sedan, Vert all use the same lengths, IF everything else matches. Gearbox, 6-bolt or 4-bolt diff determine length.
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Old Wed, Mar-08-2017, 01:41:02 AM   #5
thirtysixnick
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Default Re: 3.23 LSD to 3.15 LSD?

Quote:
Originally Posted by jayjaya29 View Post
You can easily swap the flanges. They pop right out with a prybar.
Found a really explanatory video on the flange swap. Super happy it's a simple swap. Looks like I might finally get a working differential in and can hopefully make a detailed thread over my car soon! LOL

Link to video if anyone else runs into this noob problem and finds this thread:
(quality is semi bad, but it is almost 9 years old so )
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Old Wed, Mar-08-2017, 01:58:35 AM   #6
Braymond141
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Default Re: 3.23 LSD to 3.15 LSD?

FYI a few months into the 97 production model year, BMW switched from 6-bolt to 4-bolt input shafts on the diff. You will need to deal with that if applicable. Manual 95 M3 use 6-bolt diffs.
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Old Wed, Mar-08-2017, 02:07:44 AM   #7
thirtysixnick
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Default Re: 3.23 LSD to 3.15 LSD?

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Originally Posted by Braymond141 View Post
FYI a few months into the 97 production model year, BMW switched from 6-bolt to 4-bolt input shafts on the diff. You will need to deal with that if applicable. Manual 95 M3 use 6-bolt diffs.
Mines a 6 bolt so it works out gr8.
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Discussing 3.23 LSD to 3.15 LSD? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)