best diff ratio for e30 320i

[ED1RTY 2]

Upgrading from small case to medium case. Currently have a 3.45 ratio

I want good accelleration but dont want my gears being to short/long

Any reccomendations?

[E30stz 0]

Dunno if its of much help but the 3.91 was the factory standard for a manual E30 320i.

Edited April 18, 2007 by E30stz

[ED1RTY 2]

Dunno if its of much help but the 3.91 was the factory standard for a manual E30 320i.

Can they be found in medium case?

Mine must still be the auto one..

[Mike 1]

Any reason you want the med case, a small case will be fine with a 2.5

I'd go 3.91 as well, my mate had one in his 320i and it was good.

Chris (nz320i) has one as well, ask him about it.

I think factory auto 320 diff was more like a 4,45

[ED1RTY 2]

Yea, upon putting my trailing arm and subframe/diff back together and when using the small diff the halfshaft are on a mega angle and the dust caps for the oil seals on the diff are the medium case ones that came with the disc'd rear. I need to change to a medium case to rectify these problems

[bravo 34]

I found 4.11 to be a bit short, but only just - go a 3.91 or at tallest a 3.71 for a manual 320.

[antony 0]

i've got a 4.45 in my auto.

will be looking for a 3.91 once i go manual.

[bravo 34]

Had a 4.45 in my 320 auto when I went manual - Waaaaay tooo short.

[Silver Fox 43]

Hi, I've got a 4.1 medium case if you're interested?

[ED1RTY 2]

If i cant find a 3.91 or 3.71 ill be keen.

PM me your details so i can keep in touch.

Also how much will you be after??

[drifty325i 0]

If i cant find a 3.91 or 3.71 ill be keen.

PM me your details so i can keep in touch.

Also how much will you be after??

Im running a 3.73 lsd with a v8!!!!!!! it will be interesting to say the least

[Carl 3]

3.91 will still be on the short side, 3.73 would be ideal blanace, i'm running 3.64 which is good, 3.45 is common but starts to get a little long

[ED1RTY 2]

Yea the 3.45 i had in was prettty long had to rev for ages to get anywhere.

3.64 - 3.72 seems the go.

What can i get one of these out of?

What does a 323 come standy with??

[Carl 3]

323 = 3.64

Emailed sent

[tibbs.james 1]

so can anybody confirm what a stock standard 320I Auto diff is ? my car is F/L does that make any change to it?

My car ( F/L auto )does aobut 3000 rpm @100kmh is that any indication as to what diff i have?

[antony 0]

so can anybody confirm what a stock standard 320I Auto diff is ? my car is F/L does that make any change to it?

My car ( F/L auto )does aobut 3000 rpm @100kmh is that any indication as to what diff i have?

mines a 4.45. (auto 320i) i'm assuming it's medium case, becuase of previous posts on this thread on disc breaked rear end?

Edited May 2, 2007 by antony

[Carl 3]

Last two 320i F/L autos i've seen had small case 4.45 diffs.

[nz320i 0]

yeah i bought mine off mike, and 3.91 is really good for road use, could be lower, but i like it for acceleration