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      05-16-2021, 04:11 PM   #1
Piper1
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Really silly question on pre/post facelift diffs

A quick search didn’t come up with it, anyone know are prefacelift e85 diffs direct swap to post facelift e86?
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      05-16-2021, 05:11 PM   #2
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Chassis and cradle is the same between non M E85 and 86, whether facelift or not.

Diffs from many different BMW's are an exact swap. I will be running an X3 diff for the first bit of this season to see if I like it.

I have used an E46 diff in the past as well as an SMG diff from a 3.0si.

There was a website around called BokchoysBMW for a long time with an interchangeability list on it, unfortunately it's offline now.

https://www.e46fanatics.com/threads/...-gone.1288847/
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Last edited by Steeler; 05-16-2021 at 05:38 PM..
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      05-16-2021, 05:14 PM   #3
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Quote:
Originally Posted by Piper1 View Post
A quick search didn’t come up with it, anyone know are prefacelift e85 diffs direct swap to post facelift e86?
ooh here we go

https://web.archive.org/web/20200622...GearRatios.htm
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      05-16-2021, 06:28 PM   #4
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Tops love web archive. Thanks for finding it.

Will preserve it on here so it doesn't get lost.
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      05-16-2021, 07:05 PM   #5
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Quote:
Originally Posted by dbarton62 View Post
Awesome thanks I’d gone to that site gauging rpms when I was researching changing to a 4.10 but couldn’t remember the url. I still have my stock from my prefacelift diff sitting in the garage and tempted to do some swapping around for my new to me e86. So now just decisions on which to put on what car now or to go with something different all together.
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      05-16-2021, 07:34 PM   #6
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Quote:
Originally Posted by Piper1 View Post
Awesome thanks I’d gone to that site gauging rpms when I was researching changing to a 4.10 but couldn’t remember the url. I still have my stock from my prefacelift diff sitting in the garage and tempted to do some swapping around for my new to me e86. So now just decisions on which to put on what car now or to go with something different all together.
Not sure there is an OEM 4.10. Closest I believe is a 3.91. Or there
is a 4.44 from an X3.
Aftermarket likely best bet if stuck on 4.10.
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      05-16-2021, 08:14 PM   #7
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Quote:
Originally Posted by dbarton62 View Post
Not sure there is an OEM 4.10. Closest I believe is a 3.91. Or there
is a 4.44 from an X3.
Aftermarket likely best bet if stuck on 4.10.
Yeah I went with diffsonline for the 4.10 and decided to keep my stock diff rather than send it in for core credit so it’s been sitting in the garage from my e85. https://web.archive.org/web/20200729095621/http://www.bokchoys.com/differential/e46_gear_ratio_calculator.htm
That was their page when I was going through the different ratios when originally looking so that’s my next conundrum. All fun.
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      05-19-2021, 10:26 AM   #8
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That's an awesome website, thanks for sharing! I was always under the impression that the Z4M transmission was geared longer than the E46 M3's but it seems that there isn't really much of a difference to speak of at all.
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