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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 01-14-2012, 08:43 PM   #1
SoloII///M
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DIY Differential gear swap

Guys,

Have any of you done a rear gear swap? My race car has a 3.38 in it and I found a set of 3.23 gears I want to swap in to get a few more 2nd gear revs. I have the diff housing out of the car, pulled the output flanges and the seals and the snap rings but I think the outer bearing races are going to get damaged during removal. It is not easy to pull them on the E46 diff as compared to the earlier cars.

Is there some trick to removing them?

Thanks in advance.
john V
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Old 01-15-2012, 02:53 PM   #2
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Nevermind... figured it out. They were just stuck in the housing and came out with a little tapping. Just need to pull the pinion and disassembly will be done.
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Old 01-15-2012, 07:04 PM   #3
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Just wondering, but why didn't you just replace the whole unit? They're plentiful and not all that expensive. My stocker is taken apart in my garage, but that's a curiosity thing.
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Old 01-16-2012, 06:43 AM   #4
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Not sure what you mean by "replace the whole unit."

The differential unit itself is a BMW Motorsport LSD unit. I'm just changing the gear ratio.
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Old 01-16-2012, 11:25 AM   #5
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Then that's a different story. It looked like you just wanted to go from a 3.38 to a 3.23.
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Old 01-16-2012, 12:16 PM   #6
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I don't suppose any of you guys out there have a spare open diff laying around? I don't see anyone ever putting these up for sale but having one on hand would be a huge help so I can scavenge more shims...
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Old 01-16-2012, 01:46 PM   #7
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I have two, one in 3.46 and the other 2.93, I'm in Northern VA. Will sell for the right price...
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Old 01-17-2012, 02:18 PM   #8
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Found a 2.93 and a 3.07 locally for cheap, so I should be set on shims now.
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Old 01-18-2012, 08:58 PM   #9
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I have a 2.93 with broken spider gears. If u want it just pay shipping. Im in 33157 if u want it

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Old 01-19-2012, 07:15 PM   #10
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Probably not worth the shipping costs but thanks for the offer. If you decide to trash it, take ten minutes and pull the shims from the output. you can't buy them from BMW and the various differential builders will definitely want them.
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Old 01-20-2012, 09:24 AM   #11
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If u give me sometime i might be able to pull them out. Ill try tonight.

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Old 01-20-2012, 09:58 AM   #12
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Thanks - no rush. You'll need a hefty set of snap ring pliers or a good set of needle nose and some patience. The snap rings are the shims on the 210 diffs and they are super beefy.
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