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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-06-2012, 08:18 AM   #1
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M3 rear diff swap to 325i touring

I'm new to e46 world and I'm planning on doing m3 rear end swap on my wagon. I did search this forum and gather the parts I need to this swap from various thread. I just want to double check w/ who done this swap on sedan/wagon.
As far as I understood parts that I need to this swaps are:
-diff
-carrier
-subframe
-sway bar
-axles
-drive shaft

Do I need control arms and trailing arms? Also I need rear section of drive shaft right? I have stock 5spd and I'm not planning on doing 6 spd swap since I'm thinking about dropping LSx motor or retro fit e36 motor and boost it(if it's possible)

Oh year my car is 01 325i touring.

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Old 02-06-2012, 08:25 AM   #2
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Rotors and calipers
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Old 02-06-2012, 10:09 AM   #3
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That 3.62 out of the M3 is going to be awful short in a 5-spd with a 6500 rpm red line....
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Old 02-06-2012, 11:34 AM   #4
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Yep. A raised redline via Shark injector will help, but 6th gear would be a plus. 3.46 is short enough

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That 3.62 out of the M3 is going to be awful short in a 5-spd with a 6500 rpm red line....
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Old 02-06-2012, 05:55 PM   #5
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It won't be driving w this motor for long. Motor and trans are next.
330i stud; do I have to swap out control arm and trailing arm?
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Old 02-06-2012, 06:11 PM   #6
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Yes you'll need the whole m3 rear end all the way down to the brake lines I believe.
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Old 02-06-2012, 08:42 PM   #7
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yes you will need the trailing arms and control ams, hubs, and everything stated above
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Old 02-06-2012, 08:56 PM   #8
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You will need pretty much everything from the trans and back. With a 5spd, I'm 99% sure a custom driveshaft is involved as mine is.
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Old 02-14-2012, 12:19 PM   #9
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thats bummer. I'd like to keep my offset
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Old 03-13-2012, 09:48 PM   #10
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Some of the above is not accurate.

For a 330 with 6 speed, you need:

driveshaft
diff
subframe
axles
sway bar

For a 5 speed you need all of the above except your driveshaft needs to be shortened since the M3 diff is longer front to back.

For reference, the 330 six speed driveshaft is 1440 mm long and the M3 driveshaft is 1404 mm long. Again, it's shorter due to diff size.

The diff size is also the reason behind needing the M3 sway bar. The diff pokes out a little more on the M3 and a non-M sway bar will rub the back housing of the diff.

You can re-use your non-M upper control arms, lower control arms and trailing arms. Matter of fact, I believe by using the M3 trailing arms you will actually end up with the wider track width of an M3. While this is cool, the rear fenders are not large enough to accommodate this added width and therefore your tires will poke out beyond the fenders in the back. Not good.

If anyone wishes to dispute anything I have posted, feel free as I think we as a community will all benefit. I have all the parts listed above for the swap in to my 330 6 speed and will actually be doing this swap during the first week of April.
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Old 03-14-2012, 12:18 PM   #11
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Thanks for info! I really wanted to keep my offset as is.
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Old 04-01-2012, 10:04 AM   #12
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it's not the axle that makes the M3 rear wider, it is the offset of the wheels. I had a M3 rearend swap completed and with it, -1.8 camber, and fenders rolled fit 18x9.5 offset 35 with 265/35/18 Pilot Super Sports at stock ZHP ride height.
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Old 04-01-2012, 10:54 AM   #13
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Is it controll arm different from m3 to non m?
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Old 04-01-2012, 04:36 PM   #14
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Really only need from M3

Subframe
Diff
Half Shafts
Drive Shafts
Sway Bar

-Trip
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Old 04-01-2012, 04:44 PM   #15
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Upper and lower rear control arms are IDENTICAL with non-m and M. Identical part numbers.

M3 has the same rear track as non -m , the distance from rotor to rotor is the same. The wheels is what makes M3 wider at the rear.

You need everything just as others have mentioned, in fact I dont understand why wouldnt you want to buy everything together as it'll be cheaper then trying to piece the rear together.
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Old 04-01-2012, 04:53 PM   #16
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How do you guys plan to, and those that have already. How do you deal with the custom driveshaft? Are t those ridiculously expensive?
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Old 04-01-2012, 05:29 PM   #17
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Quote:
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How do you guys plan to, and those that have already. How do you deal with the custom driveshaft? Are t those ridiculously expensive?
They just cut and reweld and balance. About 150 bux or so...
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Old 04-01-2012, 06:19 PM   #18
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What? That's it. Wtf. Why haven't I though about doing this before.
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Old 04-01-2012, 06:27 PM   #19
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Quote:
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What? That's it. Wtf. Why haven't I though about doing this before.
Depends on what DS u have will need the CV section.
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Old 04-01-2012, 06:28 PM   #20
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Oh. 5 sp?
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