engine and drivetrain Lsd Swap

[PetrolJunky]

Hello,

 

I have the LSD that is in the photo and I am going to swap it with the one that is currently in the car. I am totally not sure what it entails. I am assuming I can just drop the subframe and pull the old one out and bolt the new one in... but I am sure I am wrong.

 

Please school me.

 

Thanks guys!

Matt

[KFunk]

No need to drop the subframe, just the bolts on the holder bracket on the back, the 4 bolts on the bottom, the 4 bolts on the driveshaft, and the 8 (?) allen head bolts on each axle.

 

You also need to make sure you have the right spacers/threaded flanges, and/or the E21 CVs.  These issues are covered extensively in a write-up on the FAQ:

http://www.bmw2002faq.com/_/technical-articles/engine-and-drivetrain/bmw-2002-differentials-guide-r36

 

http://www.bmw2002faq.com/_/technical-articles/engine-and-drivetrain/how-to-replace-a-differential-r119

 

Edit: I don't know why the 2nd write-up shows removing the allen head bolts from the outer CV joint to pull axles completely, as I didn't have to do that.  If you want more fun though, go ahead.

Edited January 29, 2014 by KFunk

[Chamonix72]

You will also need to swap the rear cover from the old diff onto the new one.

[Cru Jones]

Marshall did a really nice write up on this a month ago.

 

http://www.bmw2002faq.com/_/technical-articles/engine-and-drivetrain/how-to-replace-a-differential-r119

[eurotrash]

And, LSD is a type of differential.  Is your current 2002 differential an LSD?  Rotate a wheel, if the other turns the same way, then yes.

Edited January 29, 2014 by eurotrash

[eurotrash]

Post a nice clean shot of one of your current differential's output flange.  So I can see the distance from the connection to the half shaft to the diff body.  If there's almost an inch from the back of the output flange to the dust cover, you have what you need to make this work.  I can walk you through it.

[Preyupy]

Don't take your old one out yet!  That is not a 2002/E21 diff you have there.  It looks like an E30 diff turned up-side-down.  They are NOT a bolt in swap into a 2002. 

[eurotrash]

Eeesh.  Nice catch.  Guess we don't see enough e21/e30 covers around here... 

 

 

Don't take your old one out yet!  That is not a 2002/E21 diff you have there.  It looks like an E30 diff turned up-side-down.  They are NOT a bolt in swap into a 2002. 

[M3M3]

Edit: I don't know why the 2nd write-up shows removing the allen head bolts from the outer CV joint to pull axles completely, as I didn't have to do that. If you want more fun though, go ahead.

as it says in the 2nd write up..you don't need to remove the outers.

Don't take your old one out yet! That is not a 2002/E21 diff you have there. It looks like an E30 diff turned up-side-down. They are NOT a bolt in swap into a 2002.

yup. E30. not interchangeable with 2002.

[PetrolJunky]

well that answers that... any use for that e30 lsd?

[AceAndrew]

Well if I remember correctly you're looking to do a boosted M20, correct?  If so, you do have a use for that LSD.

[gliding_serpent2]

well that answers that... any use for that e30 lsd?

The e30 lsd spool can be made to work with a e21/2002 diff. Edited January 30, 2014 by gliding_serpent

[M3M3]

only if that e30 diff is the small version from a 318.

 

see andrew's detailed how to article on this.

Edited January 30, 2014 by mlytle

[Ken]

Contact Rob at 2002 Haus phone # 805-541-2002, there is a bolt in option for a e30 medium case differential into a 2002.

[Mike Self]

movieprodw--do you know what ratio your E30 diff is and/or what model E30 it came from?  I'm looking for a good 4.11 limited slip for my 91 318is coupe...

 

cheers

mike