What diff ratio do I have?

[M-technik-3]

Very simple, located on the back of the diff hangs by the fins about 1.5 inches long and 1/2 in wide. if it says numbers and S it's a LSD if no S it's not a LSD.

[Digitalwave]

Yeah, i.e. a 4.10 LSD says "S 4 , 1 0" on the tag.

[Kondour]

88 325is automatic has an 3.73

[e28jay]

Thanks guys. I'll crawl under there tonight and let you all know what it says.

[e28jay]

Crawled under the car yesterday and it does in fact have a 3.73 LSD!!!

Thanks everyone!

[f u z z]

well i crawled under my 318is, and i could not find a tag, or anynumbers or letteres. well besided the part number, does anyone know what kind of diff. a 91 318is has?

[M42Technik]

well i crawled under my 318is, and i could not find a tag, or anynumbers or letteres. well besided the part number, does anyone know what kind of diff. a 91 318is has?

4.10 LSD. Unless I'm mistaken. Which I'm pretty sure I'm not.

[Digitalwave]

LSD was an option on 318iS's. Many cars did not have them. They all had 4.10 small case diffs, some where LSD, some weren't.

[f u z z]

i see i see. thanks!

[Mystikal]

Get both rear tires in the air, put it in neutral and drop the brake, and spin one wheel. If the other spins the same direction, it's an LSD.

Figuring out the diff ratio isn't hard either if you just take note of the RPM/speed ratio.

[KenC]

Crawled under the car yesterday and it does in fact have a 3.73 LSD!!!

Why does everyone freak out about having a limited-slip? I reckon that half of them aren't even functioning properly any longer...

[Mystikal]

Not to mention that if they actually needed it or knew what it does they would know if they had it already.

[OreoGaborio]

Why does everyone freak out about having a limited-slip? I reckon that half of them aren't even functioning properly any longer...

mine is 17 years old & it absolutely still works... i got it slightly stuck in the snow once, put it in gear, let out the clutch & car wasn't moving, so i actually got out of the car & looked at the wheels... both were spinning and in the same direction... couple shoves & i was out

and this is in my '87 325 (non E) w/ absolutely no other options cept the LSD

i love my LSD in the winter... works like a charm :up:

[e28jay]

I knew I had the LSD just wasn't sure what the gear ratio was. I've never heard that LSD are not working these days, mine actually works damn good!

[GreekDriver]

My old 325i had an LSD, this damn convertible has an Open Differential. I know that as winter was hell with the cabrio compared to the 325i sedan.

My cabrio has an automagic, is it a 4.10?