DIY: 3.46 differential swap from 1 series to an e90

incantana · 09-25-2011, 10:38 PM

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.

RupertPupkin · 09-26-2011, 07:45 PM

in for updates. good luck. How much and where did you get the Diff? Let us know how easy it is.

daheechang · 09-27-2011, 09:46 PM

+1 for updates

cdavi060 · 04-03-2012, 01:43 PM

guess it never took off?

WhiteonWheat · 04-21-2012, 01:10 PM

Updates? I'm subscribing

yakev724 · 04-21-2012, 03:28 PM

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.

Eternal · 04-21-2012, 03:32 PM

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?

incantana · 12-30-2012, 10:39 PM

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.

09-25-2011, 10:38 PM	#1
incantana Captain 47 Rep 662 Posts Drives: 2019 Z06/Z07 3LZ; 2008 E93 M3 Join Date: Apr 2011 Location: USA iTrader: (3)	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
RupertPupkin Major 103 Rep 1,456 Posts Drives: Freak Beast Join Date: Aug 2011 Location: East iTrader: (5)	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
daheechang Colonel 131 Rep 2,424 Posts Drives: E30 m3 Join Date: Jul 2006 Location: Shoreline iTrader: (14)	+1 for updates
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04-03-2012, 01:43 PM	#4
cdavi060 Private First Class 31 Rep 179 Posts Drives: 2006 BMW 330i Join Date: Mar 2012 Location: Virginia Beach, VA iTrader: (3) Garage List 2006 BMW 330i [0.00]	guess it never took off?
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04-21-2012, 01:10 PM	#5
WhiteonWheat Second Lieutenant 23 Rep 237 Posts Drives: 2011 335i (AW e90 LCI) Join Date: Feb 2011 Location: Atlanta iTrader: (2)	Updates? I'm subscribing
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04-21-2012, 03:28 PM	#6
yakev724 Brigadier General 246 Rep 3,563 Posts Drives: 15 S3 Join Date: Jul 2010 Location: NYC iTrader: (49)	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
Eternal Lieutenant 96 Rep 463 Posts Drives: 2015 435i xDrive Join Date: Feb 2012 Location: North Carolina iTrader: (3)	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, 10:39 PM	#8
incantana Captain 47 Rep 662 Posts Drives: 2019 Z06/Z07 3LZ; 2008 E93 M3 Join Date: Apr 2011 Location: USA iTrader: (3)	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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