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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-04-2014, 04:53 PM   #1
scd325
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Join Date: Apr 2014
Location: Miami
Posts: 9
My Ride: 2003 325
SMG to MANUAL...what rear diff?????

Hello,

My name is Angelo, im fairly new to the forum. I mostly stay on the DIY section since its the first time I own a BMW.

I do appologize before hand if im posting to the wrong forum but there is a question that has been annoying me for a while now.

My car is an 03 325i that came from factory with an SMG tranny, which I ended up swapping for a manual trans. Long story short, the manual, tranny is a 5 speed that when we first did the swap went thru the gears way too quick. the car had no top end at all, therefore we swapped out the rear diff for the one from a auto 330i, now its not all that great on top end but I do feel the car should feel better power wise and I blame the rear diff for it.
My question is... what rear diff should I be using?

If im not mistaken, this car should making around 300hp
I have a c30 supercharger kit stage 2 from active
tuned by active
my entire exahust system came from active. from headers to tip
upgraded inyectors
FMIC and a few other things

Ive been a car guy my whole life. im a DSMer at heart and i know for a fact what 300hp should feel like and this car isnt putting all that out there and I believe that my trans and my rear diff arent working together all that well

Angelo
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Old 09-07-2014, 09:40 AM   #2
Slapsys
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Join Date: Jun 2011
Location: Calgary, Alberta, Canada
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3.46
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Old 09-07-2014, 10:10 AM   #3
David McMahon
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http://www.bokchoys.com/differential...calculator.htm
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Old 09-07-2014, 10:23 AM   #4
t5contradiction.
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What part of miami are you in
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Old 09-07-2014, 12:01 PM   #5
scd325
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Location: Miami
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Quote:
Originally Posted by t5contradiction. View Post
What part of miami are you in

Im from Miami but at thr moment im in Panama, and the car we're talking about is here too

In Miami i have a 07 GTI
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Old 09-07-2014, 12:04 PM   #6
scd325
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Join Date: Apr 2014
Location: Miami
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My Ride: 2003 325
The 3.46 diff came off of what car?

I have access to an ALL bmw junk yard so finding a replacement is easy...also if you guys need parts for any bmw let me know i might be able to help
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Old 02-22-2015, 10:24 PM   #7
Mihainede85
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hi scd325...... you did the swap yourself or somebody did it for you? Was that a pain in the ....?
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