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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 12-08-2015, 12:02 PM
JustaBMWguy JustaBMWguy is offline
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Mein Auto: 1995 520i
E36 Diffy Question - LSD components into a Auto 3:91 diff?

Hey Gang!

I recently acquired a 92 E36 325 5 spd manual and the LSD is sporting the ever-popular bearing noise upon acell / decel - sounds like the pinion bearing is headed south for the winter - In my searching I found a 3:91 Diffy out of a '97 Automatic E36 328 non M-series car.

I've done some searching but cannot come up with a real conclusion so I am turning to the group here as the professionals - here is the question:

Can I get the 3:91 rear end and keep the assembly parts in order, putting them back to keep the adjustments the same, take the LSD CLUTCH ASSEMBLY out of the current noisy diffy and place the LSD components in where the "open" spider gears are?

The end result would be a 3:91 LSD which would be fun, have to admit -

Both seem like they are the same diffy housing-wise and such... I wanna say 188mm?

Thanks for the advice, I appreciate it!! Ya'll rock!

~Brian
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1995 E34 520i Auto
1992 E36 325i 5 spd
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  #2  
Old 12-10-2015, 09:09 AM
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Flug540 Flug540 is offline
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Location: Hayward, CA
 
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Mein Auto: 1998 BMW 540i 6-spd
That wouldn't work, the carrier itself is very different LSD vs. open.
You can't put a clutch assembly into the open carrier, you have to swap the entire carrier to make an LSD out of an open diff.
I've just finished rebuilding mine, but what I ended up doing is ditching my open diff and getting a very tired 3.15 M3 LSD for cheap and completely rebuilding it including new bearings/clutches/dog-eared plates and different gearing.
Another thing that also comes to mind... don't assume used OEM diff has perfect alignment. When I first opened the M3 LSD and checked the gear mashing pattern, it was off by quite a bit and needed to be realigned with different shims anyway.
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Last edited by Flug540; 12-10-2015 at 09:10 AM.
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Old 12-10-2015, 11:11 AM
JustaBMWguy JustaBMWguy is offline
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Location: Forest Grove, Oregon
 
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Mein Auto: 1995 520i
Ok, good advice!

Thanks very much, I appreciate it -

How much did it run you to rebuild - from what I've found seems like around $200 for parts-

I wonder if this is something I can adjust out with reshim - my initial guess is no, that if it's bearing wear the lash is done...

Appreciate your advice-



Thanks again-

~Brian
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1995 E34 520i Auto
1992 E36 325i 5 spd
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Old 12-10-2015, 11:26 AM
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Flug540 Flug540 is offline
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Mein Auto: 1998 BMW 540i 6-spd
Quote:
Originally Posted by JustaBMWguy View Post
Ok, good advice!

Thanks very much, I appreciate it -

How much did it run you to rebuild - from what I've found seems like around $200 for parts-

I wonder if this is something I can adjust out with reshim - my initial guess is no, that if it's bearing wear the lash is done...

Appreciate your advice-



Thanks again-

~Brian
No, it's a lot more than that, probably around $500 just for the consumables.
Then for me it was a new gear set, another $$$, and then labor if you are not doing it yourself.
You need to take it apart and examine the bearings.
In my case it was pretty clear they were shot.
If you don't mind shipping, I can recommend an awesome diff rebuilder local to me.
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Old 12-10-2015, 11:46 AM
JustaBMWguy JustaBMWguy is offline
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Location: Forest Grove, Oregon
 
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Mein Auto: 1995 520i
I'll hit you up -

Thanks sir!
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