What is this "P" stenciled on my LSD?

General conversations about BMW E28s and the people who own them.
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Bonsaibacker
Posts: 929
Joined: Oct 26, 2017 3:36 PM
Location: Palatka FL

What is this "P" stenciled on my LSD?

Post by Bonsaibacker »

Looking to sell this but I am curious what the "P" indicates. On a medium case 3.91 LSD. On the passenger side of the housing (barely visible in the second picture)
Thanks in advance.

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jc72
Posts: 710
Joined: Aug 16, 2010 11:52 AM
Location: Oakland, CA

Re: What is this "P" stenciled on my LSD?

Post by jc72 »

Never seen a “P” but viscous ones out of ix e30’s where marked with “V” and rebuilt/reman ones were marked with “R”.

someone on r3v was asking the same question and it ended up being an open diff. Have you taken the cover off and looked inside?
https://www.r3vlimited.com/board/forum/ ... f?t=290168
Bonsaibacker
Posts: 929
Joined: Oct 26, 2017 3:36 PM
Location: Palatka FL

Re: What is this "P" stenciled on my LSD?

Post by Bonsaibacker »

I have opened it up. Definitely a clutch type limited slip. Performs as expected and clutches break free at 63+ ft/lbs.

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Cactus
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Joined: Jun 06, 2010 4:13 AM
Location: Dayton, OH

Re: What is this "P" stenciled on my LSD?

Post by Cactus »

The S on the tag (S3,91) denotes the LSD.
Bonsaibacker
Posts: 929
Joined: Oct 26, 2017 3:36 PM
Location: Palatka FL

Re: What is this "P" stenciled on my LSD?

Post by Bonsaibacker »

Cactus wrote: Aug 08, 2022 9:30 PM The S on the tag (S3,91) denotes the LSD.
True but you can buy those on eBay...
1st 5er
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Re: What is this "P" stenciled on my LSD?

Post by 1st 5er »

Bonsaibacker wrote: Aug 09, 2022 6:01 AM
Cactus wrote: Aug 08, 2022 9:30 PM The S on the tag (S3,91) denotes the LSD.
True but you can buy those on eBay...
That simple huh!?!? :laugh:
BDKawey
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Location: Carrollton, Ohio

Re: What is this "P" stenciled on my LSD?

Post by BDKawey »

P for positrac? :laugh:
stuartinmn
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Re: What is this "P" stenciled on my LSD?

Post by stuartinmn »

My guess is it's simply an inspection stamp left over from when the car was built.
Bimmerguy2002
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Re: What is this "P" stenciled on my LSD?

Post by Bimmerguy2002 »

BDKawey wrote: Aug 09, 2022 3:47 PM P for positrac? :laugh:
https://www.youtube.com/watch?v=1E6IfdUJn6s
Bonsaibacker
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Re: What is this "P" stenciled on my LSD?

Post by Bonsaibacker »

Thank you for the input and tangents. Not every day you get a Joe Dirt reference...

The mysterious P diff.
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