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View Full Version : stock diff for a 1990 325i?


Jase
07-20-2004, 10:45 PM
What would the gear ratio be for a auto 1990 325i?. I figure it may be a few different ones. But What are the options?How can I check?. Can this be used in a 5spd?

Jordan
07-20-2004, 11:31 PM
should be a 3.73:1 open diff.

If the car is automatic it would be a 4.10:1 open diff

anything else was optioned by the purchaser, or swapped in later.

Jase
07-20-2004, 11:33 PM
Thanks,

So can the 4:10 be run in a 5 spd?..problems pros cons?

T.Dot_E30
07-20-2004, 11:34 PM
umm ppl say faster acceleration, higher rpms on the highway.

Lower top speed

Jase
07-20-2004, 11:35 PM
but no real issues otherwise..Not like I travel at 160 all the time..

BMW_M52_M20
07-20-2004, 11:49 PM
Higher geared diff will give you nice pull, will lose in the top end. As Jordan said probably 3:73 open diff, is what is in there.

I would have liked a higher geared diff to transfer the torque from my 325e to the ground!*uzi*
haha
Jay

Jase
07-20-2004, 11:51 PM
well it is from a auto so it would be a 4:10

Jordan
07-20-2004, 11:54 PM
why would you want a open 4.10 in your car?

BMW_M52_M20
07-20-2004, 11:55 PM
Originally posted by Jase
well it is from a auto so it would be a 4:10

haha, yeah I just read that now that it was an auto.
Jay

BMW_M52_M20
07-20-2004, 11:56 PM
Originally posted by Jordan
why would you want a open 4.10 in your car?

More low end grunt for my car......
Jay

Jase
07-20-2004, 11:56 PM
cause i dont have another rearend at the moment. and the one in the car is shot. it will make a fix for now

chromius
07-21-2004, 09:47 AM
Originally posted by BMW_M52_M20
More low end grunt for my car......
Jay

Yes but if you are gonna do it don't get an open diff, get an LSD...otherwise I wish you luck trying to get traction.....especially in the winter.:)

mikee30
07-21-2004, 10:11 AM
Snow tires with studs....worked for me last winter
Add some junk in the trunk and you'll have traction

chromius
07-21-2004, 10:21 AM
Originally posted by mikee30
Snow tires with studs....worked for me last winter
Add some junk in the trunk and you'll have traction

Yes but if he is replacing the diff anyway, why not just save yourself the trouble and get an LSD, you will not regret it, its also more fun for drifting.:)

I picked up an LSD diff in perfect condition out of a scrap yard for $300*th-up*

BMW_M52_M20
07-21-2004, 11:03 AM
Originally posted by chromius_e30
Yes but if you are gonna do it don't get an open diff, get an LSD...otherwise I wish you luck trying to get traction.....especially in the winter.:)

Who cares, LSD in the winter, this thing is a hog in the winter regardless, I like having both wheels going:D

Jay

chromius
07-21-2004, 11:55 AM
Originally posted by BMW_M52_M20
Who cares, LSD in the winter, this thing is a hog in the winter regardless, I like having both wheels going:D

Jay

exactly...if you like having both wheels going then you need a LSD, otherwise you have one wheel going:)

Jase
07-21-2004, 07:39 PM
I dont plan on driving my car in the winter ..plus money is a concern for me at the moment. A 410 open is better tahn a bad one right now

chromius
07-22-2004, 08:32 AM
Originally posted by Jase
I dont plan on driving my car in the winter ..plus money is a concern for me at the moment. A 410 open is better tahn a bad one right now

True enough...:)

The Sly
07-22-2004, 02:48 PM
Originally posted by Jordan
should be a 3.73:1 open diff.

If the car is automatic it would be a 4.10:1 open diff

anything else was optioned by the purchaser, or swapped in later.

Jordan would you know what came in the 88 convertible.....since the car is a little heavier i was told a 4.10 but i need to hear from people that knows for sure....

Skunk#1
07-22-2004, 02:55 PM
i think it was the numerically lower, higher gears, the 3.7/1. the higher gearin i think came on the ix and the m3 only, but not sure. i know that my 325is has a 4.1/1 and has a spool in it but i know that is not factory, it is out of an m3. but i think it has a 3.7 stock. but ya, if the car is auto it will be different than stick.