Looking for 3.91 open diff

[bmw1602.com]

Located in LA. would prefer local but willing to pay for shipping.

[man_mark_7]

I'm pretty sure I have one - it would be a "long" differential, correct? I haven't taken the cover off to count teeth, but it seems to spin about 3.91 just eyeballing. If you can't find anything local let me know and I can dig into it.

[man_mark_7]

FYI, I get "Error establishing a database connection" when I try to go to http://www.bmw1602.com/

 

Mark

[Conserv]

Long-neck differentials were phased out in early 1969. In general, a 3.91 is an e21differential, hence a short-neck differential. A 3.90, used in 1976 49-state versions of the ‘02, is, indeed, an ‘02 differential and also a short-neck differential. 

 

Based solely on odds, I’m guessing that the original poster — who either has a post-early-1969 1602 or, possibly, an early 1600-2 converted to a short-neck rear subframe — is looking for a short-neck differential. But, yes, the forum needs more info to confirm this.

 

Regards,

 

Steve

 

Edited September 26, 2019 by Conserv

[bmw1602.com]

Yes I am using a short neck 3201 LSD at the moment.

 

I want a open diff so I can weld it (race car)

 

The track I will use this at is suited for teh 3.91 this is why i am looking specifically for that

[shermanmartinez]

You could also use a short neck 4.10 differential from a 71 1600.The difference between the 76 3.90 and a 3.91 is inconsequential and would work just fine.  I could provide you with an open 3.91 E21 differential for $250.

shermanmartinez at hotmail dot com