E90 330i Rear Differential Question

simpleM3 · 01-31-2015, 10:55 AM

Will I experience any adverse effects by having an 08 328i rear differential installed onto my 06 330i? Both being 6mt. The ratio for 330i is apparently 3.15 and the one for the 328i is 3.23. What differences will I experience in performance?

Phil325i · 01-31-2015, 12:19 PM

Problem you'll find is that BMW don't supply internal parts for their diffs, only complete replacement units. You'll need to find a transmission specialist...

hassmaschine · 01-31-2015, 01:33 PM

they actually can be rebuilt. BMW really sucks these days though, they used to list all the parts for things like the gearboxes and differentials individually (doesn't mean you can't get the parts, just not through BMW). I guess their take is they can't make money paying clueless dealer techs to screw up diff rebuilds they're not qualified to do.

somebody who works on differentials/transmissions could do it. but, they don't really go bad that often. a used one would be an acceptable alternative.

simpleM3 · 01-31-2015, 01:41 PM

i'm looking into that now but i can't find one from a 330i without a shit on of miles, which is risky. I have 137k miles and its whiny as hell. does not sound like a bmw

Quote:

Originally Posted by hassmaschine

they actually can be rebuilt. BMW really sucks these days though, they used to list all the parts for things like the gearboxes and differentials individually (doesn't mean you can't get the parts, just not through BMW). I guess their take is they can't make money paying clueless dealer techs to screw up diff rebuilds they're not qualified to do.

somebody who works on differentials/transmissions could do it. but, they don't really go bad that often. a used one would be an acceptable alternative.

F30RiK · 01-31-2015, 02:13 PM

I have one for sale for 250$ if you want, 330i 2006 with 111 000 miles red line oil no whine work like a new one

simpleM3 · 01-31-2015, 02:25 PM

where are you located? can you email pics to dannyc617@yahoo.com

Quote:

Originally Posted by Rikrikrik

I have one for sale for 250$ if you want, 330i 2006 with 111 000 miles red line oil no whine work like a new one

F30RiK · 01-31-2015, 04:11 PM

Im in canada montreal but I can send it to you. I will send pic tonight, I took it off to put a shorter ratio one.

alfazrus · 01-31-2015, 11:39 PM

Why don't you just put one from 330i auto with 3.64 for a little fun?

alfazrus · 01-31-2015, 11:41 PM

and less work, direct swap.

mbanks21 · 02-20-2015, 02:19 PM

That's only about a 3% difference in ratios. I'd find a 3.38 or get the 3.64 from the auto 330i, that's what I did.

01-31-2015, 10:55 AM	#1
simpleM3 Major 173 Rep 1,416 Posts Drives: 06' E46 M3 ZCP Join Date: Nov 2013 Location: Fairfax, VA iTrader: (13) Garage List 19’ BMW M5C [0.00] 2007 E61 530XI [0.00] 2006 E46 M3 [0.00]	E90 330i Rear Differential Question Will I experience any adverse effects by having an 08 328i rear differential installed onto my 06 330i? Both being 6mt. The ratio for 330i is apparently 3.15 and the one for the 328i is 3.23. What differences will I experience in performance? Last edited by simpleM3; 01-31-2015 at 01:39 PM..
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01-31-2015, 12:19 PM	#2
Phil325i Brigadier General 639 Rep 3,216 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Problem you'll find is that BMW don't supply internal parts for their diffs, only complete replacement units. You'll need to find a transmission specialist... __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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01-31-2015, 01:33 PM	#3
hassmaschine Major General 3987 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	they actually can be rebuilt. BMW really sucks these days though, they used to list all the parts for things like the gearboxes and differentials individually (doesn't mean you can't get the parts, just not through BMW). I guess their take is they can't make money paying clueless dealer techs to screw up diff rebuilds they're not qualified to do. somebody who works on differentials/transmissions could do it. but, they don't really go bad that often. a used one would be an acceptable alternative.
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01-31-2015, 02:13 PM	#5
F30RiK Lieutenant 130 Rep 409 Posts Drives: 13' 335 xdrive M-sport 6 Speed Join Date: Aug 2014 Location: QC, LAval iTrader: (1)	I have one for sale for 250$ if you want, 330i 2006 with 111 000 miles red line oil no whine work like a new one
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01-31-2015, 04:11 PM	#7
F30RiK Lieutenant 130 Rep 409 Posts Drives: 13' 335 xdrive M-sport 6 Speed Join Date: Aug 2014 Location: QC, LAval iTrader: (1)	Im in canada montreal but I can send it to you. I will send pic tonight, I took it off to put a shorter ratio one.
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01-31-2015, 11:39 PM	#8
alfazrus First Lieutenant 101 Rep 309 Posts Drives: 2006 e90 330i Join Date: Oct 2012 Location: DC iTrader: (2)	Why don't you just put one from 330i auto with 3.64 for a little fun?
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01-31-2015, 11:41 PM	#9
alfazrus First Lieutenant 101 Rep 309 Posts Drives: 2006 e90 330i Join Date: Oct 2012 Location: DC iTrader: (2)	and less work, direct swap.
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02-20-2015, 02:19 PM	#10
mbanks21 Colonel 1281 Rep 2,962 Posts Drives: 2015 335i MSport Join Date: Aug 2013 Location: High Bridge, NJ iTrader: (8)	That's only about a 3% difference in ratios. I'd find a 3.38 or get the 3.64 from the auto 330i, that's what I did.
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