Genuine BMW BMW Differential and Gearing Upgrades for BMW 3 Series E91 (2006-2012)

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Upgrading various parts of the differential can have tremendous benefits in your car's performance. It's easy to forget that the differential is a source for making your car faster and handle better so it's often overlooked. The engine is not the only place to make the car faster. Our differential options vary from gearing upgrades to limited slip conversions. You can purchase the ring & pinion gear sets on their own (professional installation required) or have us build a diff around your own specifcations. The options are almost endless! Every custom-built diff is fully rebuilt with seals and bearings. We also design and supply bushing options to reduce driveline wind-up, finned differential covers for better cooling, and more!

Ratio Changes - Changing the differential gearing is one of the best and most-effective upgrades you can make on any BMW (old or new). By using a shorter (numerically higher) final drive ratio you are increasing your RPM relative to road speed - this puts you in a more powerful RPM range than before! Since you're in a 'meatier' part of the power band you're now putting down more power/torque to the ground. If you can trade outright top speed for faster acceleration at daily speeds then this is the perfect upgrade for you.

Limited Slip Upgrades - Sadly, many BMWs today are not equipped with a limited slip (posi-traction) differential. BMW has tried to compensate by using traction control that cuts power at the engine or applies the brakes to retard wheel spin (or a combination of both). But nothing beats the function and feel of a a true LSD which may be why BMW continues to use them in M cars. Our LSD upgrades can be done a number of different ways - a factory-type limited slip unit with either 2 or 3 clutch packs, helical type, OS Giken unit, or something truly custom. We can also vary ramp angles and setup to change the limited-slip behavior under acceleration, deceleration, and cornering. Need a custom diff? Call or e-mail to have a quote.

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BMW Differential Seal - Rear Axle
For pre LCI models 335i, 335is and 335xi, from production date 07/2009
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T#:31655802
Part#: 33108860346
Ships in 3 Business Days
2% off MSRP $ 96.58

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$ 94.99 USD
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$ 96.58

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$ 94.99 USD
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Proper fluid levels in the rear differential are crucial for its performance and longevity. Ignoring a leaking shaft seal can lead to severe damage. Each vehicle requires two seals.
Genuine BMW Rubber Mounting Front - 33176760287 - E82,E90,E92,E93 ...
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T#:25594
Part#: 33176760287
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13% off MSRP $ 59.99

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$ 52.99 USD
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$ 59.99

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$ 52.99 USD
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Bushings tends to wear over time and split or even break free from the internal sleeve, causing excessive movement and sloppy control feel. Genuine BMW bushings are the perfect option to restore suspension back to day 1 quality.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!


Genuine BMW Rubber Mounting Front -
This item fits the following BMW Chassis:
E82,E90,E92,E93

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Genuine BMW Output Shaft Seal Dust Cover - Large
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T#:59505
Part#: 33131428097
Ships in 3 Business Days
5% off MSRP $ 56.99

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$ 54.00 USD
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5% off MSRP
$ 56.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 54.00 USD
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Genuine BMW Dust Guard Ring, Outer - D=68,8
This item fits the following BMW Chassis:
E39,E46,E53 X5,E65,E70 X5,E82,E83 X3,E85,E86,E89 Z4,E90,E92,E93,F01,F02,F06,F10,F12,F13,F15,F16,F25 X3,F26 X4

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Complete Xdrive Differential And Transfer Case Service Kit
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Genuine BMW - Corporate Logo
T#:587067
Part#: 07512293972TKT
In Stock
$ 184.99

This product was last offered at the strikethrough price on
06-03-2026

$ 179.99 USD
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$ 179.99 USD
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Genuine BMW Rear Differential Carrier Bushing
Rear Position
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T#:25596
Part#: 33176770866
Ships in 1-2 days
13% off MSRP $ 83.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 72.99 USD
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13% off MSRP
$ 83.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 72.99 USD
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Genuine BMW Rubber Mounting Rear -
This item fits the following BMW Chassis:
E82,E83 X3,E85,E86,E90,E92,E93

Genuine BMW Output Shaft Seal - 33107505604
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T#:360861
Part#: 33107505604
In Stock
9% off MSRP $ 18.20

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 16.50 USD
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9% off MSRP
$ 18.20

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$ 16.50 USD
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**Will only fit E92's after a production date of 9/2007 Two seals are required per vehicle. Maintaining a proper amount of fluid in the rear differential is vital to the performance and longevity of the differential. If a leaking shaft seal is left untouched, the results could be catastrophic.
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Driveshaft Seal
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T#:362306
Part#: 31507609535
In Stock
12% off MSRP $ 18.20

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$ 15.95 USD
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12% off MSRP
$ 18.20

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$ 15.95 USD
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Genuine BMW Engine & Trans Suspension Hex Nut With Plate 22316760944 ...
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T#:7561
Part#: 22316760944
In Stock
$ 2.99 USD
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Genuine BMW Hex Nut With Plate - M8
This item fits the following BMW Chassis:
E30 M3,E36 M3,E34 M5,E39 M5,E60 M5,E63 M6,E46 M3,E82 1M Coupe,E85 Z4M,E30,E34,E36,E38,E39,E46,E63,E65,E82,E85 Z4,E86 Z4,E89 Z4,E90,E92,E93,F22,F30,F31,F32,F33,F34,F36,F80 M3,F82 M4,F83

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Differential Drain Plug with O-Ring - Most BMWs
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Genuine BMW - Corporate Logo
T#:7923
Part#: 33117525064
In Stock
15% off MSRP $ 11.61

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$ 9.87 USD
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$ 11.61

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$ 9.87 USD
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This is the front or rear Genuine BMW differential fluid drain plug for many BMWs. This can also be the transfer case plug or automatic transmission plug on some BMWs.

+ Year & Model Applications
(click to expand)
This item fits the following BMWs:
1970-1976 2002 BMW 1600 2002 2002tii
2008+ E82 BMW 128i 135i 1M Coupe
1977-1983 E21 BMW 320i 323i
1984-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is 325ix M3
1992-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi 335d 335i 335xi 335i xDrive M3 - Sedan
2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon
2007-2012 E92 BMW 328i 328xi 328i xDrive 335i 335is 335xi 335i xDrive M3 - Coupe
2007-2012 E93 BMW 328i 335i M3 - Convertible
1976-1981 E12 BMW 528i 530i
1982-1988 E28 BMW 524td 528e 533i 535i 535is M5
1989-1995 E34 BMW 525i 530i 535i 540i M5
1997-2003 E39 BMW 525i 528i 530i 540i M5
2004-2010 E60 BMW 525i 525xi 530i 530xi 528i 528xi 528i xDrive 535i 535xi 535i xDrive 545i 550i M5
2010+ F07 BMW 535i GT, 535i xDrive GT, 550i GT, 550i xDrive GT
2011+ F10 BMW 528i 528i xDrive 535i 535i xDrive 550i 550i xDrive M5
1982-1989 E24 BMW 633csi 635csi M6
2004-2010 E63 BMW 645ci 650i M6
2012+ F12 BMW 640i 650i
1981-1987 E23 BMW 733i 735i
1988-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
2009+ F01 BMW 740i 740li 750i 750li 750i xDrive 750li xDrive 760li
1990-1999 E31 BMW 840i 840ci 850i 850ci 850csi
2004-2010 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2011+ F25 BMW X3 xDrive28i X3 xDrive35i
2000-2006 E53 BMW X5 3.0i X5 4.4i X5 4.6is X5 4.8is
2007-2013 E70 BMW X5 3.0si X5 4.8i X5 xDrive30i X5 xDrive35d X5 xDrive35i X5 xDrive48i X5M
2008+ E71 BMW X6 xDrive35i X6 xDrive50i X6M
1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si Z4 M Roadster M Coupe
2009+ Z4 BMW Z4 sDrive30i Z4 sDrive35i Z4 sDrive35is
2000-2003 E52 BMW Z8 Roadster

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Genuine BMW Front And Rear Differential Service Kit
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Genuine BMW - Corporate Logo
T#:577470
Part#: 075122939722KT
In Stock
$ 89.99 USD
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$ 89.99 USD
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Genuine BMW Hex Bolt With Washer - 31517547750
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Genuine BMW - Corporate Logo
T#:55879
Part#: 31517547750
In Stock
$ 9.99 USD
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Genuine BMW Hex Bolt With Washer - M10X55-10.9Zns3
This item fits the following BMW Chassis:
E83 X3,E90,E92

Genuine BMW Hex Nut With Plate - 07129904862
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Genuine BMW - Corporate Logo
T#:28828
Part#: 07129904862
In Stock
$ 3.99 USD
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Genuine BMW Hex Nut With Plate
This item fits the following BMW Chassis:
E39 M5,E60 M5,E63 M6,E46 M3,E70 X5M,E71 X6M,E85 Z4M,E53 48IS,E30,E36,E38,E39,E46,E53 X5 X5,E63,E65,E70 X5,E71 X6,E85 Z4,E86 Z4,E89 Z4,E90,E92,E93,F01,F02,F06,F10,F12,F13,F15,F16

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Front Differential Input Shaft Seal
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Genuine BMW - Corporate Logo
T#:485407
Part#: 31527507697
Ships in 3 Business Days
7% off MSRP $ 13.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 12.99 USD
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7% off MSRP
$ 13.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 12.99 USD
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Seals the input shaft flange to the front differential
Genuine BMW Lock Ring - 27107539525
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Genuine BMW - Corporate Logo
T#:53816
Part#: 27107539525
Ships in 3 Business Days
6% off MSRP $ 16.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 16.00 USD
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6% off MSRP
$ 16.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 16.00 USD
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Replace these when reassembling the transfer case. Genuine BMW Lock Ring - 28X2 This item fits the following BMW Chassis: E70 X5M,E71 X6M,E53 48IS,E53 X5,E70 X5,E71 X6,E83 X3,E90,E92,F01,F02,F06,F10,F12,F13,F15,F16,F25 X3,F26 X4 X4,F30,F31,F32,F33,F34,F36
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Genuine BMW At-Front Differential I=3,64 - 31507572052 - E90,E92 ...
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Genuine BMW - Corporate Logo
T#:55841
Part#: 31507572052
Ships in 3 Business Days
4% off MSRP $ 2,833.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 2,706.99 USD
4% off MSRP
$ 2,833.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 2,706.99 USD


Genuine BMW At-Front Differential - I=3,64
This item fits the following BMW Chassis:
E90,E92


At-Front Differential - E60, E61, E90, E91, E92
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Genuine BMW - Corporate Logo
T#:55858
Part#: 31507601768
Ships in 9 Business Days
4% off MSRP $ 2,833.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 2,706.99 USD
4% off MSRP
$ 2,833.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 2,706.99 USD


Genuine BMW At-Front Differential - I=3,46
This item fits the following BMW Chassis:
E90,E92


E9X 325i/328i/330i Differential Upgrade - 3.64 Original BMW
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Genuine BMW - Corporate Logo
T#:338092
Part#: 33107566176
Ships in 9 Business Days
Starting at $ 2,412.29 USD
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Starting at $ 2,412.29 USD
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This is a complete differential to change the gearing of a manual transmission E90/E92 325i, 328i, or 330i (not for xi models) to a 3.64 ratio final drive. The standard gearing on the manual transmission cars is 3.15 or 3.23, making this E90 diff significantly shorter. This diff is from a 330i automatic where the gear ratio has to be shorter to make up for the transmission gearing differences and extra weight. This will dramatically improve acceleration on any 325i, 328i or 330i INSTANTLY! If you are looking for better off-the-line or rolling acceleration, and are willing to sacrifice a little top-speed (some of us don't get up to 150mph), this is one of the best ways to achieve it with almost no downside. There are few things that can improve your 0-to-60 and 0-to-100 times as much as shorter gearing, and this differential is clearly a best "bang-for-buck" solution for dramatically better acceleration. Since this is an Original BMW part it carries the same BMW two year warranty as any other new part. So there's no need to take a chance on a used part from a private seller. (former BMW part number 33107519944)

Changing gear ratio changes the RPM range for any given speed. Use the chart below for examples of speed vs RPM changes for the 3.64 diff.
 

2006 330i, 6-speed manual, stock 3.15 gears, 255/35-18" rear tires

Gear RatioGearSpeedRPM

40 MPH in 4th

3.154th40 MPH2,100 RPM

3.644th40 MPH2,400 RPM

70 MPH Cruise

3.156th70 MPH2,500 RPM

3.646th70 MPH2,900 RPM

5th Gear Speed @ 6,000 RPM

3.155th142 MPH6,000 RPM

3.645th123 MPH6,000 RPM

Why 5th? Because 6th does not have the mechanical advantage to get past wind resistance at these speeds - it is more of a cruise/overdrive gear. Using 5th for comparison purposes is much more relevant than having to take into account wind direction, resistance, grade, elevation, tire sizing, etc. These numbers are for comparisons among gear ratios only, not to determine what your E90 will top out at.2006-2011 325i or 328i, 6-speed manual, stock 3.23 gears, 255/35-18" rear tires

(click to expand)

Gear RatioGearSpeedRPM

40 MPH in 4th

3.234th40 MPH2,150 RPM

3.644th40 MPH2,400 RPM

70 MPH Cruise

3.236th70 MPH2,600 RPM

3.646th70 MPH2,900 RPM

5th Gear Speed @ 6,000 RPM

3.235th138 MPH6,000 RPM

3.645th123 MPH6,000 RPM

Speed in 5th gear at 6,000 RPM is for theoretical and comparison purposes only. It doesn't mean that these speeds are actually reachable.


A $100 refundable core charge must be added at the time of order. This core charge can be refunded when you ship your original diff back to us.

This item fits the following BMWs with manual transmission only:
2006-2011 E90 BMW 325i 328i 330i - Sedan
2006-2012 E91 BMW 325i 328i - Wagon
2007-2013 E92 BMW 328i - Coupe
2007-2013 E93 BMW 328i - Convertible

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