Some diff questions

[kokgo20]

1-What models use 210mm LSD carrier that can be used in our diffs?
2-Will the 3.91 gears from the E53 X5 4.6is and E53 X5 4.8is works and fit directly to our E46 M3 LSDs?
3-Is REM polishing is really beneficial?

Thanks in advance!

[bigjae46]

1. Most V8s in E24/28/32/34 cars. M cars as well.

2. 3.91s will not work - it is a type 215.

3. REM polishing makes a difference. Probably worth it for a track/race car. It will reduce heat in the diff.


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[kokgo20]

2. 3.91s will not work - it is a type 215.

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could you tell me about the difference in the 215 type gears VS E46 M3 LSDs?

[mrgizmo04]

Per this site, it'll take a 215

https://www.difflab.com.au/pages/bmw-differential-types

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[mrgizmo04]

And per this site e53 4.6 and 4.8 will fit.

https://www.google.com/amp/s/oppositelock.kinja.com/the-cheap-er-e46-m3-final-drive-upgrade-1503641554/amp

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[bigjae46]

If someone has a type 215 gear set then I can see if it fits.

I’m not sure I believe that...at least I’d need some proof.

Type215s use a roller bearing...I think.

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