Not another old diff question...Well maybe...

[tn325i]

I haven't had this car long but out of curiosity from reading many post here and asking friends a lot questions..

Anyway, I had to find out what was in my car. So I crawled under it..

All that I have read on this forum I have not heard mention of the gear ratios in my car..
The tag says S2.79 ?? I know the "S" is limited slip, but 2.79 ??
I thought the lowest ratio was 2.91?

Would this be original to my car?
1985 - 325e

I have a pic of the tag I'll try to post later if needed...

[matt]

You thought wrong. And it could be original.

[tn325i]

It looks to be original, I just had not seen the numbers before..

I guess I could get some decent + changes with a 3.25 or 3.73 ???

[Van Westervelt]

3.25 dont go to the 73.

[Rigmaster]

early ('84-85) 325e's had 2.79 diffs- some LSD as you have found. Later ('85-up) 325e's had 2.93 diffs.

As has been mentioned, I would go with a 3.25 ratio for a good improvement in acceleration, but without losing too much top end- or revving the piss out of the car at highway speeds.

If you decide to do the swap- you'll find 3.25 ratio diffs in many E28 5 series cars- you'll have to confirm that it's LSD though as they seem to be hit and miss in those cars. I might know someone who would buy your 279LSD if you want to sell it- lemme know.


Bret.

[///Mpressive]

My 84 came with a 2.93 open. I'm upgrading to a 2.93 LSD for my engine swap though.

early ('84-85) 325e's had 2.79 diffs- some LSD as you have found. Later ('85-up) 325e's had 2.93 diffs.

As has been mentioned, I would go with a 3.25 ratio for a good improvement in acceleration, but without losing too much top end- or revving the piss out of the car at highway speeds.

If you decide to do the swap- you'll find 3.25 ratio diffs in many E28 5 series cars- you'll have to confirm that it's LSD though as they seem to be hit and miss in those cars. I might know someone who would buy your 279LSD if you want to sell it- lemme know.


Bret.

[tn325i]

I would sell or trade for a 3.25lsd if anyone is interested. Mine is in very good condition.. I'll even clean the outside before it is shipped..

I am putting a 323I euro head on very soon and would really like to swap the diffy as well.. I am pulling the rear subframe out to replace bushings, It would be a great time to do it..

[tn325i]

Update;

I found a 3.46 lsd I'm going to put in my car.. I want to do the diff first then I'll slap the 323I euro head on to see what happens..

Looking forward to some fun.. Some friends and I are going to Road Atlanta Oct 6-8 for a Peachtree evnt.. So I gotta have it ready by then..

[matt]

I will see you there. :)

[tn325i]

Look us up man.. We are usually the only one with 3 - 10x10 white canopies hooked together.. Ely (Rs4pro3) will be there with us..

An E46 M3 and 2 E30s (White & Delphin) and I don't know yet what else..

See ya then!
Steve

[tn325i]

I got the 3.46 in and wow ! What a difference a day makes...

The diff swap is a def plus... Now to get the euro head on it...