Diff options/opinions for swap

[madjurgen]

just redline in 5th @90 was a bit much.

haha

[Mr.SWISS]

I had the open 4.10 leftover from the auto trans for the first month and first was topped out at ~ 20mph. Damn torquey and fun, just redline in 5th @90 was a bit much.

I got a 3.25 LSd out of a E28.

[ericzz]

346:1 With An E36 Trans Is Awsome Fun .

[matt]

Wow... my 3rd goes to almost 95 with a 3.25. I can't imagine gears that short.

[mazur]

Gear Mph per 1000 RPM Mph @7000 RPM Mph @7000 RPM
--------------------------------------------------------
1 4.25 30
2 7.13 50
3 10.72 75
4 14.56 102
5 17.91 125

That's ZF tranny with 4.1 diff and 245/45/16 tires...congradulations, 1st gear barely exists.

[matt]

E30 G260 tranny with 4.1 diff = I dont know what would come out of this... any tips?

3rd:
E36 M3 trans with 3.25 diff = this would give me more economy than torque??? :S

These two options are roughly equivalent.

I am about to put in a 3.73 and I have an e36 trans. I decided I want to take advantage of the peaky nature of my motor pre-turbo.

[techmaniac]

Hi, I´m also starting this september my S50 swap, anyway... I was thinking in 4 diferent set ups for the tranny and diff, but havent found any usefull info... coments would be great...

1st:
E36 M3 trans with 4.1 diff = this should really give me some bad ass torque?? this would mean that at 100km/hr I would be around 4k rpms?

2nd
E30 G260 tranny with 4.1 diff = I dont know what would come out of this... any tips?

3rd:
E36 M3 trans with 3.25 diff = this would give me more economy than torque??? :S

4th:
E30 G260 trans with 3.25 diff = any coments about this one??

I care about high speed at low rpms, ending-speed, speedway confortability and a fun rear.... and I dont know how to get a little of everything...maybe another diff??

any tips are good tips...thanks

[e30polak]

a little too torquey = 3.46

is that even possible?

i like getting the extra traction off the line and the longer gears, second of all i live in LA so traffic on the 405 and the 10 suck balls with a short 1st and 2nd

[Bmjpv]

Got the 3.73 again?

Ok ,I've got this done now,Installed a 2.93lsd in my 24v ,zf gear boxed 88'325is.. Yes the 3.25 lsd that I bought for my 24v swap to replace my stock 88' 325is (3.73lsd) turned out to be Another 3.73 and not the 3.25 that I wanted !! I installed yesterday a 2.93 lsd , I pulled the cover plate and counted teeth ,11-41 ,do the math and you get 3.73 again!! This 3.73 that I bought had 3.25 painted on the top and a tag for the 3.25 bolted to the cover ,Why wouldn't I beleave it's not a 3.25 ?? Anyway I like this gearing for driving ,nice change but I can Now see that the 3.25 could be a perfect gearing for 24v ZF gearboxes. FOR SALE NICE 3.73 lsd !! How dumb is all of that ?? joe

[Ablice]

I plan on starting with a 3.25LSD with my planned M50 swap. At 65mph/108kph that tach will be at 2500rpm. I liked the 2000rpm of the 2.79 eta :(

I'm thinking about a 2.93 or something, I want something tall geared (I'm using a Getrag 260) for fuel economy. Can the M50 pull a 2.79 or 2.93?

[rede30]

there is a 3.46 option out there. I always forget about it myself, but i might try it out since my 3.25 is not as locky as it should be.

[Bmjpv]

I got 3.73s again ??

Ya ,the new (3.25 ?) went in at time of 24v install and ya the motors fun but I got tired real fast about not going fast ! If that's what happened,that I installed another 3.73lsd to replace my orginal 3.73lsd than that's about the dumpest BMW thing I've read about !! But it happened to ME !! I bought a 3.25lsd, but what do I get ?? someone else do the math and what do I have ? joe

[static]

is that even possible?

took words outta my mouf

yea more torque, but have to row the shifter more often

[madjurgen]

a little too torquey for my taste

is that even possible?

[Bmjpv]

My 3.25 lsd ??

First I had a 3.73 in my 88'is with the m20 motor,, In doing the 24v swap installed a 3.25 lsd !,, I installed a 95'zf M3 gear box ,,I'm turning 4k at 72mph ,, I'm running the 205/55/15 tire ! After reading this I think I don't have a 3.25 ,maybe what ?? I'll do the math ,,What did I install another 3;.73 ?? What ever I have it's not to good for these california freeways. !! joe

Well I did the math an I'm coming up with that 3.73 that I just got rid off !! I need to hear from other on the ratio issue ,,I was about to install a 2.93 lsd thinking that was my next swap !