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Old 03-31-2006, 07:51 PM   #1
Zim Zimma
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Finally NEW DIFF IS IN

So I bought an M3 DIff about 4 months ago and finally about a week ago I put it into my 98' 328is.

The car pulls alot harder in all gears now and the rpm's seem to always be in the power range. Not to forget its also LSD

There has'nt been a significant difference in fuel consumption....But then again I would'nt be sure as I have been driving with my foot on the floor since I put it in.

I would highly recommend this mod to anyone who is considering it..
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Old 03-31-2006, 09:40 PM   #2
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Im assuming you got the 3.23 LSD then...

How much did you pay for it - Im currently looking for one right now
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Old 03-31-2006, 10:40 PM   #3
bmnorm
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I want to get my diff changed before the summer to.
how much did you pay? did you do the install, was it hard?
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Old 03-31-2006, 11:56 PM   #4
thinair
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I'd recommend a shorter diff as the FIRST power mod anyone with a 328 do first.
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Old 04-01-2006, 01:44 AM   #5
Zim Zimma
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I paid around high 600$ ish for the diff...it previously had 45k on it...so very good condition...I did not do the installation myself, but I helped the mechanic out..I really wanted to do it myself but i only have like screw drivers etc at home so that pretty much killed that dream....I have'nt paid for the install yet (I'm friends with the mechanic, but I beleive it will be around 150-200 $ for installl.)

For diff's shop around I paid high 600's for mine but lately I've seen some for alot cheaper...But as mentioned the diff I got was extremely low mileage.

Installation honestly is easy as pie...you just need the right tools...Me and the mechanic did it in like just over and hour and a half.

I want to thank thinair as I most likely annoyed the hell out of him with my constant questions...but if you are seriously considering this mod, shoot him a Pm he knows alot more about the details...

Thanks alot thinair!!

Last edited by Zim Zimma; 04-01-2006 at 01:46 AM.
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Old 04-01-2006, 02:12 PM   #6
fletch
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did you have to modify drive shift or anything? can my 320 put a M3 diff in just as easy as yours? and what's a shorter diff?
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Old 04-01-2006, 02:13 PM   #7
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so is it a 3.15 or a 3.23?
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Old 04-01-2006, 02:17 PM   #8
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Quote:
Originally Posted by fletch
did you have to modify drive shift or anything? can my 320 put a M3 diff in just as easy as yours? and what's a shorter diff?
I believe the 320 shares the subframe with the 318, so you'd need the subframe of a 325/3288/M3.
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Old 04-01-2006, 02:20 PM   #9
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yea 320 also use the same diff as 318... so is subframe same as subframe reinforcement plate?

Quote:
Originally Posted by thinair
I believe the 320 shares the subframe with the 318, so you'd need the subframe of a 325/3288/M3.

Last edited by fletch; 04-01-2006 at 02:23 PM.
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Old 04-01-2006, 02:26 PM   #10
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^^ no, you need to swap out the differential carrier, also known as the rear subframe, and the rear axle carrier. It's the part where the diff bolts into, as well as the 4 control arms.

http://www.realoem.com/bmw/showparts...66&hg=33&fg=30
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Old 04-01-2006, 02:34 PM   #11
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so basiclly i need the whole rear end..wow that's alot work, but seems M3 has different carrier than 325/328 so even 325/328 needs M3 carrier and 4 control arms..etc?

Hey i just found that my 320 has same everything from the link you gave me?
http://www.realoem.com/bmw/showparts...66&hg=33&fg=30

i think i gonna use realoem to compare what's different in rear end of M3&320 first..so i don't ask alot of stupid questions...sorry

Quote:
Originally Posted by thinair
^^ no, you need to swap out the differential carrier, also known as the rear subframe, and the rear axle carrier. It's the part where the diff bolts into, as well as the 4 control arms.

http://www.realoem.com/bmw/showparts...66&hg=33&fg=30

Last edited by fletch; 04-01-2006 at 02:41 PM.
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Old 04-02-2006, 05:36 AM   #12
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The site is wrong, I know as a fact the rear carrier off a 318-320 can not fit the bigger type 188 gearset diff without alot of grinding.
Although the site has same part #'s for the 318 & the 325.

http://www.realoem.com/bmw/showparts...66&hg=33&fg=30
Compared too
http://www.realoem.com/bmw/showparts...66&hg=33&fg=30

Just goes to show experience goes farther then internet facts...
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Old 04-02-2006, 08:15 AM   #13
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diff a great mod

i did the 3.15 diff in my 328i as well - highly recommended!

thanks to thinair as well for answering my many questions.

cheers.
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