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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-07-2014, 11:07 AM   #1
hatetolovee46
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Join Date: May 2014
Location: mass
Posts: 13
My Ride: 323i
3.07 to 3.46 Dif swap

I searched and found some diy's but not an answer to this question don't hate me plz! I have a 5spd 323i in gd condition other than the famous rear end clunk, my friends friend with a auto 323i's in terribad condition(clear coat failure, rips in seat ect) tranny died and is scraping the car, I swooped in and got it for close to free

Now since I have the rear end thud anyway and my 323i is in good condition otherwise I want to swap the 3.46 dif into it and replace all differentail bushings. Since it's possible the rear end clunk is also the subframe bushings I'm going to pull the subframe and do those as well, and since I'm pulling both of those and the subframe mounts have never been reinforced i'm going throw in the rear subframe mount reinforcement kit(already ordered for 130)

Little late in the game to be doing this with 170k on the car but idc I just want the thud gone

My question is thus, all DIY's and the hane's manual ofc say to mark the drive shaft to the input dif flange so you line it up right after and it is balanced, If i'm swapping the dif should i just cross my fingers it will be balanced after or go back and rotate it if there is a vibration, or can any shop balance it and if yea what's the usual charge for this?

Also how will this effect the cars electronics if at all? Won't throw a incorrect gear ratio code or anything will it assume all these sensors are upstream of the dif? Assume all electronics will be indifferent to the change yes?

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Last edited by hatetolovee46; 08-07-2014 at 11:19 AM. Reason: *
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Old 08-12-2014, 06:33 PM   #2
JasonSmithed
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I can't remember but it seemed as though the splines are on the guibo side. The rear diff just bolts on the end of the driveshaft. My clunk ended up being the flex disc/guibo. This took me maybe 4 hours to do. Good luck.
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Old 08-12-2014, 06:37 PM   #3
JasonSmithed
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Four hours for the whole swap. I marked the shaft in its relation to the guibo and tranny with white out.
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Old 08-12-2014, 06:41 PM   #4
JasonSmithed
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Old 08-13-2014, 11:58 AM   #5
Bino5150
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That rear end thud is more than likely the subframe ripped loose from the car, rather than the bushings going bad. You might want to check... This is a known issue, and there's a little more to it that swapping parts. Other than curing the "thud", what do you hope to accomplish by swapping the differential?
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Old 08-13-2014, 10:03 PM   #6
JasonSmithed
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There is a reinforcement kit. It's pricey for this car. Inspect the rtabs.
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Old 08-14-2014, 12:43 PM   #7
Bino5150
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The reinforcement kit is actually not expensive. What is expensive is the actual repair, unless you can weld and have a lift.


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