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View Full Version : rear end question, thinair you might know


windsor318is
11-01-2007, 06:26 PM
well ive offically started my s52 swap by beginning to remove my paperweight m42, im going to start a thread on it tomorrow. but anyways id like to know if rear diffs from e36s are direct bolt ons? i know alot of you use the 3.73 but what id like is for my car to be super quick on the streets, dont really care about highway, if my max is 140 kph in 5th at 3000rpm, im happy with that. what rear diff do i need?

e30_kid89
11-01-2007, 06:33 PM
Nope, e36 diffs wont bolt-on. If you're running the ZF transmission w/a 3.73 rear end you'll be very quick off the line but have retarded high rpms on the hwy. If you want it to get regular rpms you'll need a 3.46, or 3.25 diffs found in the old e24s (6 series) and e28s (5 series). A 2.whatever diff from a 325E would work too if you really want good mileage.

BmW1819
11-01-2007, 07:29 PM
i think the z3 diff are a straight bolt in i have seen a e36 m3 diff in a e30 before :) not sure about the year of the diffey

Chris de la Cruz
11-01-2007, 09:09 PM
welll just to give you an idea,

with the m50 + getrag 260 + 3.73 at 140 km/h i'm at about 4000 RPM IIRC

and thats with the longer gearing

with an e36 tranny 5th gear would be like 4th in the getrag

windsor318is
11-01-2007, 09:59 PM
cool thats perfect then, thanks guys ill start searching for the 3.73, whats a good price, theres one on ebay right now with 83,000 original miles.

NickP
11-02-2007, 12:13 AM
well ive offically started my s52 swap by beginning to remove my paperweight m42, im going to start a thread on it tomorrow. but anyways id like to know if rear diffs from e36s are direct bolt ons? i know alot of you use the 3.73 but what id like is for my car to be super quick on the streets, dont really care about highway, if my max is 140 kph in 5th at 3000rpm, im happy with that. what rear diff do i need?

What trans are you planning on using? The final ratios are really different.
Most find an LSD from an e28, e24, e23 etc.

Mystikal
11-02-2007, 01:21 AM
with the m50 + getrag 260 + 3.73 at 140 km/h i'm at about 4000 RPM IIRC

Nope. 3740rpm by my calculations.

So with an E36 transmission, 140km/h and stock sized tires would be 4549rpm. Jesus.

Jay

Chris de la Cruz
11-02-2007, 08:04 AM
i was close enough.

craz azn
11-02-2007, 01:12 PM
pwn3d *shiner*

Mystikal
11-02-2007, 03:37 PM
If it makes you feel better, Zimmie will hit his rev limiter in 5th at 193km/h and Jon at 198km/h. I say we race the Bimmersport boys, starting at 160.

Jay

ABUSTAIF
11-02-2007, 05:28 PM
lets start from 200 ;)

Axxe
11-02-2007, 06:15 PM
I'll bring the 6 speed *wave*

windsor318is
11-02-2007, 06:48 PM
jay, im using the m3 5 speed that comes with the s52, what rear diff should i get? like i said 140 is good enough for me

Axxe
11-02-2007, 09:54 PM
3.25 out of a manual E28 535i

windsor318is
11-03-2007, 11:44 AM
how about a 635i? thats stick?

Mystikal
11-03-2007, 12:26 PM
Yeah, a 3.25 would be ideal. If you really don't give a damn about gas mileage or the insane highway revs, just run a 3.73 out of a 5-speed E30 325i/iS.

Jay

windsor318is
11-03-2007, 07:19 PM
sweet, thanks gay, ill start sopping then. eh did you sell your e30?

Mystikal
11-04-2007, 07:55 PM
Of course not! I bought the M3 to take my daily/winter abuse.

Jay

NickP
11-04-2007, 09:46 PM
sweet, thanks gay, ill start sopping then. eh did you sell your e30?

You're talking about rear ends then you call Jay gay? I hear Jay just left Toronto to drive to Windsor - he'll be there in 40 minutes :D


PS I didn't edit the original post I swear.

windsor318is
11-05-2007, 01:15 AM
lol **** dude that wasnt on purpose!
p.s. jay i bought an e36 328is for winter beating as well(people think i should be driving the e30 in the winter), and engine swap to the e30 time.