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Old 07-19-2014, 04:33 PM   #1
Lukee9499
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Join Date: Nov 2012
Location: Gold Coast
Posts: 2
My Ride: 325ci Msport
3.91 Diff for my 325

Im after a 3.91 diff for my 325ci, i have been told all different things and don't know where to even start, could anyone help me out with some information please, would be greatly appreciated

Oh and its an auto / steptronic
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Old 07-19-2014, 05:04 PM   #2
Alexander13
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Join Date: Jan 2013
Location: Brisbane, Australia
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My Ride: 328ci
There is no such thing as a factory 188k 3.9:1 diff. There is a few options. 1) buy a complete diff from the states, shipping will kill you. B) buy diff gears from diffs on line and pay something to fit them ($795aus delivered + fitting) or c) stick with 3.46:1 and deal with it.

I've just gone down this road and option b was the easiest and cheapest
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Old 07-19-2014, 06:41 PM   #3
Davew
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My Ride: 2004 330ci Msport
Option d

http://forum.e46fanatics.com/showthread.php?t=997696

3.62 with os gilken LSD

Edit : 3.64
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Old 07-19-2014, 07:06 PM   #4
Davew
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http://www.bokchoys.com/differential/index.htm

I have linked this page a few times now, some great info and a gear ratio calculator.
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Old 07-19-2014, 07:45 PM   #5
Commando
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What about putting a 330 motor in your car - may be the cheapest option apart from doing nothing. if you buy a write-off and sell of the bits you don't need.
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Old 07-19-2014, 08:29 PM   #6
Davew
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Originally Posted by commando View Post
what about putting a 330 motor in your car - may be the cheapest option apart from doing nothing. If you buy a write-off and sell of the bits you don't need.
+1
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Old 07-20-2014, 02:20 AM   #7
Davconelectric
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Quote:
Originally Posted by Lukee9499 View Post
Im after a 3.91 diff for my 325ci, i have been told all different things and don't know where to even start, could anyone help me out with some information please, would be greatly appreciated

Oh and its an auto / steptronic
why?
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Old 07-20-2014, 03:59 AM   #8
Lukee9499
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Thanks for the opinions, also I have been following your build Alex and it looks insane haha. Most likely go with option b, pretty sure my
Mate used a shop up at Ipswich to get his skyline diff rebuilt with different gears and what not for a good price so might see what I can do there, otherwise I'll just wait till my diff is completely gone and just get a stock replacement.. Will be cheaper and might put some more money aside for a sc, bullet cars has a nice package haha, but thanks guys
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Old 07-20-2014, 04:19 AM   #9
E46 Coupe
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Originally Posted by Davconelectric View Post
why?

So the drone will make ears bleed with an exhaust/muffler of course...
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Old 07-20-2014, 05:00 AM   #10
Alexander13
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Changing centers and gears needs the shims done. BMW don't sell these so it's a machine job. I would recommend just leave it or replace the bearing.
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Old 07-20-2014, 05:36 AM   #11
Davew
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Originally Posted by Alexander13 View Post
Changing centers and gears needs the shims done. BMW don't sell these so it's a machine job. I would recommend just leave it or replace the bearing.
Once the play is dialled up, most diff places will have shim packs in multiple sizes and just make the shims to suit. Not an issue. I have a few different thicknesses kicking around the shed for my little projects. It is common.
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Old 07-20-2014, 05:43 AM   #12
Davew
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All you need to shim a non LSD diff is some feeler gauges or preferably a mag base and dial indicator, some shim pack, and some hand tools to unbolt nuts and bolts. It's like a first year apprentice module to set up a diff with shims.
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