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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: 3.46 differential swap from 1 series to an e90



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      09-25-2011, 10:38 PM   #1
incantana
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DIY: 3.46 differential swap from 1 series to an e90

Guys, I am purchasing a 3.46 differential from a 1 series and trying to mount it to my e90 330i which has a 3.15 stock differential. If all goes well I will post pics and complete the diy guide.
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      09-26-2011, 07:45 PM   #2
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in for updates. good luck. How much and where did you get the Diff? Let us know how easy it is.
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      09-27-2011, 09:46 PM   #3
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+1 for updates
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      04-03-2012, 01:43 PM   #4
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guess it never took off?
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      04-21-2012, 01:10 PM   #5
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      04-21-2012, 03:28 PM   #6
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You can get 3.73 easily since they're stock on AT 328s (and 325s).

~$350 shipped here http://www.ebay.com/itm/BMW-E90-328-...#ht_500wt_1180

If anyone's going from an AT-->MT diff (or the other way around), you'll also need the corresponding driveshaft since the lengths are different.
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      04-21-2012, 03:32 PM   #7
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Hmm, I might have to look into this. Wonder what other work would be involved. Need to find a ration calculator to see what speeds would be running at what rpms and gears.

Ohh is the 1 series an LSD?

Last edited by Eternal; 04-21-2012 at 03:39 PM.
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      12-30-2012, 11:39 PM   #8
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i never pulled the trigger on this but im fairly certain it would work flawlessly. I did this swap on my e46 a few years ago. there are several 1 series differentials on ebay for sale. someone should go for it.
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