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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Jun-04-2018, 02:21:08 AM   #1
Chapelle
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Default Diff upgrade

I’m considering upgrading to 4.10 gears since I’ll be pulling the subframe for reinforcement. I found a good deal on a ring and pinion set. Would there be anything else I need or should get for this swap?
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Old Mon, Jun-04-2018, 04:30:38 AM   #2
Texaz3
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Default Re: Diff upgrade

I would change all the bushings while you are in there.
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Old Mon, Jun-04-2018, 05:58:28 AM   #3
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Default Re: Diff upgrade

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Originally Posted by Texaz3 View Post
I would change all the bushings while you are in there.
You almost always do those anyway on a subframe job. I would def do seals and bearings prob even halfshafts and even wheel beatings depending on mileage, since your installing r&p into stock diff as opposed to putting in a new/already rebuilt diff.

Make sure you already have the updated diff bolts (rear).
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Last edited by TboneM3; Mon, Jun-04-2018 at 06:53:30 AM.
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Old Mon, Jun-04-2018, 01:56:30 PM   #4
Chapelle
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Default Re: Diff upgrade

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Originally Posted by TboneM3 View Post
You almost always do those anyway on a subframe job. I would def do seals and bearings prob even halfshafts and even wheel beatings depending on mileage, since your installing r&p into stock diff as opposed to putting in a new/already rebuilt diff.

Make sure you already have the updated diff bolts (rear).
Yeah I already have all bushings and fittings (including updated diff bolt) for the rear end. Probably going to end up doing the driveshaft CV too. Aside from RTV, new bolts to get to the R&P, I wasn't sure if anything else should be replaced while I'm inside the diff case (LSD?).

Anyone have a good resource/thread for seals and bearings part numbers around the diff? Unless it's everything on the RealOEM page...
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Old Mon, Jun-04-2018, 03:32:58 PM   #5
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Default Re: Diff upgrade

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Originally Posted by Chapelle View Post
Yeah I already have all bushings and fittings (including updated diff bolt) for the rear end. Probably going to end up doing the driveshaft CV too. Aside from RTV, new bolts to get to the R&P, I wasn't sure if anything else should be replaced while I'm inside the diff case (LSD?).

Anyone have a good resource/thread for seals and bearings part numbers around the diff? Unless it's everything on the RealOEM page...
Depending on your mileage, your LSD might not be doing much locking anymore, but if you're not tracking, it's probably not worth the effort of replacing it (expensive). I think diffsonline can rebuild the OE unit, but most people go for their modded 210mm clutch-type LSD where they add a 3rd clutch to one of these...
http://www.realoem.com/bmw/enUS/part...&q=33141206745

and set up custom ramps for you. Either that or one of their aftermarket options.

In terms of parts inside the case, maybe you'll find my notes useful. Can't guarantee they're accurate though, so good luck.

http://www.m3forum.net/m3forum/showthread.php?t=389657
http://www.m3forum.net/m3forum/showthread.php?t=491008
http://www.realoem.com/bmw/enUS/show...diagId=33_1065
http://www.realoem.com/bmw/enUS/show...diagId=33_1066

side seals: (2x) 33107510289
pinion seal: 33121213949
crush sleeve: 33121204657
pinion nut locking plate: 33121205138
side orings: (2x) 33111214144
side dust covers:
(2x) 33122283079
(2x) 33137840562
carrier bearings and races:
(2x) Timken JLM104910 (race)
(2x) Timken JLM104948 (bearing)
larger pinion bearing:
Timken HM803110 (race)
Timken HM803149 (bearing)
smaller pinion bearing and race:
Timken HM9410 (race)
Timken HM89448 (bearing)
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Old Mon, Jun-04-2018, 03:36:09 PM   #6
Chapelle
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Default Re: Diff upgrade

Ethan, good stuff. Thanks for this. Just a fun weekend street car, so not too worried about beefing things up for the track at this point.


Quote:
Originally Posted by ethan View Post
Depending on your mileage, your LSD might not be doing much locking anymore, but if you're not tracking, it's probably not worth the effort of replacing it (expensive). I think diffsonline can rebuild the OE unit, but most people go for their modded 210mm clutch-type LSD where they add a 3rd clutch to one of these...
http://www.realoem.com/bmw/enUS/part...&q=33141206745

and set up custom ramps for you. Either that or one of their aftermarket options.

In terms of parts inside the case, maybe you'll find my notes useful. Can't guarantee they're accurate though, so good luck.

http://www.m3forum.net/m3forum/showthread.php?t=389657
http://www.m3forum.net/m3forum/showthread.php?t=491008
http://www.realoem.com/bmw/enUS/show...diagId=33_1065
http://www.realoem.com/bmw/enUS/show...diagId=33_1066

side seals: (2x) 33107510289
pinion seal: 33121213949
crush sleeve: 33121204657
pinion nut locking plate: 33121205138
side orings: (2x) 33111214144
side dust covers:
(2x) 33122283079
(2x) 33137840562
carrier bearings and races:
(2x) Timken JLM104910 (race)
(2x) Timken JLM104948 (bearing)
larger pinion bearing:
Timken HM803110 (race)
Timken HM803149 (bearing)
smaller pinion bearing and race:
Timken HM9410 (race)
Timken HM89448 (bearing)
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Old Mon, Jun-04-2018, 03:49:33 PM   #7
ethan
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Default Re: Diff upgrade

Quote:
Originally Posted by Chapelle View Post
Ethan, good stuff. Thanks for this. Just a fun weekend street car, so not too worried about beefing things up for the track at this point.
Makes sense. Do you have a shop performing the swap for you?

Some more threads:
http://www.m3forum.net/m3forum/showthread.php?t=576607
https://www.bimmerforums.com/forum/s...ad.php?1650106
http://www.bimmerforums.com/forum/sh...ad.php?1920204
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Old Mon, Jun-04-2018, 04:16:56 PM   #8
Chapelle
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Default Re: Diff upgrade

Quote:
Originally Posted by ethan View Post
Yep, Coyne Performance. Whenever I decide to finally schedule this mammoth job list.
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Old Mon, Jun-04-2018, 04:23:44 PM   #9
ethan
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Default Re: Diff upgrade

Quote:
Originally Posted by Chapelle View Post
Yep, Coyne Performance. Whenever I decide to finally schedule this mammoth job list.
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Old Tue, Jun-05-2018, 09:32:50 PM   #10
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Default Re: Diff upgrade

I might have some extra timken bearings and stuff I didn't use when I gathered parts. But the list of parts are necessary and someone who has experience with diffs. The backlash settings of over tightening is a big deal and you'd get whine.

I got lucky with mine and didn't need any spacers
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Discussing Diff upgrade in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)