View Full Version : E30 Rear End

mel horn
03-19-2005, 12:00 AM
What rear end ratio should be in a 325i Automatic? 3.90 or 4.10?

(I suppose I could look at the tag but it's too hostile yet to crawl under a car. MAybe in a couple weeks...)

For that matter I am looking for a 4.10...

03-20-2005, 11:44 PM
Hey Mel. What year? Also e-30 or e-36?

mel horn
03-21-2005, 04:27 PM
Whoops, it's an 85 E30. Sorry.

Also, I found out that the rear end in the proposed donor car is bad so it doesn't matter what ratio it is. (And the guy pulled the motor/trans and is sticking in a Ford 5.0. IS NOTHING SACRED?)

Long story short I need a 4.10, somewhere...

[This message has been edited by mel horn (edited March 21, 2005).]

03-22-2005, 12:36 AM
'84-'85 318i with an automatic transmission has the 4.10 you seek.......


Dave Austin
'82 BMW 320i - ITB

03-22-2005, 09:04 AM
If the ring and pinion out of the donor car is a 4.10 and are not damaged, I may be interested in buying them from you.
Send me an email at cesenes(at)hotmail(dot)com


03-22-2005, 04:30 PM
Dave. If that 4:10 from the 318i fits your car it won't fit the 325. The 325 has the "big" diff. Look around for an automatic 325I or an M3, they should be 4:10

03-22-2005, 06:01 PM
you can move the 4.10 ring and pinion from a small case 318 diff to a medium case 325 diff.