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BMW F30 Differential and Gearing Upgrades

BMW F30 Differential and Gearing Upgrades 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.
You're currently viewing parts for your (F30) 3-Series Sedan 2012+. Reset your chassis
For accurate results, specify your model below.
Genuine BMW Driveshaft Seal 33107609536

This seal is found where the driveshaft connects to the differential.

Genuine BMW Shaft Seal - 50X78X10/15
 

This item fits the following BMW Chassis:
E70 X5M,E71 X6M,E53 48IS,E38,E39,E53 X5,E63,E65,E70 X5,E71 X6,E82,E89 Z4,E90,E92,E93,F01,F02,F06,F10,F12,F13,F15,F16,F22,F30,F32,F33,F36
 

 

Part #: 33107609536
Price: $14.95 (USD) 
Quantity:   
F3X 335i/435i Manual Limited Slip and Gearing Differential Upgrade One of the best upgrades to be made is custom building a differential. There are a lot of options to make improvements to the diff including gear sizing changes, added limited slip units, and limited slip lock-up options. It's easy to overlook the differential when planning your car's upgrades but it's one of the best areas to get return from your modification spending. Using a shorter (numerically higher) gear ratio will give you better acceleration and the limited slip effect will help get that power to the pavement. Changing the limited slip lock-up will change how the car behaves in corners - low lock-up will introduce more wheel spin; a higher lock-up will give more grip to the rear wheels but may induce an understeer condition (too much power pushing the car straight); a variable lock-up will give you the optimum balance. Our experience in diff building, car prep, and racing will ensure we get you the correct custom build for your specific driving conditions.

Gearing Changes All 335i/435i differentials have welded internal pieces that require special machining and modification. Our diff builder has perfected the process and using a shorter 3.46 ring and pinion is now no more difficult than any other car. But because of the extensive labor involved, the 3.46 is currently the only gear option offered at this time but it's perfect for keeping the N55 engines on the boost. Using a shorter gear ratio (numerically higher) will give you better acceleration but will reduce your top speed. The higher ratio puts you at a higher RPM point for any given speed. This puts you further up in the power band, giving you more torque to the ground. Refer to the chart below for examples on the difference.

2014 335i, 6-speed manual, 255/30-19" rear tires
(click to expand)
Gear RatioGearSpeedRPM
40 MPH in 4th
3.234th40 MPH2,047 RPM
3.464th40 MPH2,192 RPM
70 MPH Cruise
3.236th70 MPH2,570 RPM
3.466th70 MPH2,752 RPM
5th Gear Speed @ 6,000 RPM
3.235th138 MPH6,000 RPM
3.465th129 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.

Limited Slip Options. The 335i/435i sadly did not come with a limited slip unit. Instead, BMW used DTC (Dynamic Traction Control) to cut engine power, apply the brake(s), or a combination of both. A limited slip operates independently from either of those systems. With the LSD installed the DTC system does not engage as often. The LSD transfers torque mechanically to the opposite wheel. It will then allow some wheelspin before the traction control kicks in. If you turn off traction control you still have the torque transfer of the LSD working and then wheel spin. So you can get traction in the corner and some wheelspin out of it to facilitate rotation without engine power being cut so soon. We offer several types of F30/F32 limited slip units:
  • traditional 2 or 3-disc LSD (40-60% fixed lock-up - more than the factory M Performance)
  • 3-disc LSD with variable ramp angles (user-variable lock-up)
  • Quaife helical (no clutch discs)
  • OS Giken Superlock multi-plate LSD (0-100% lock-up)
  • OS Giken TractionControlDiff multi-plate LSD (0-100% lock-up) (smoother and quieter version of Superlock)
    Core Charge. If we are building a diff from our own stock a refundable core charge will apply until we get your original diff back. You have a maximum of 30 days from the time you receive the diff to send it back us for a refund. Click here for more detail and explanation of the core charge.

    FAQ: For a full FAQ on the custom diff process, click here.

    This item fits the following BMWs:
    2012+ F30 BMW 335i - Sedan
    2014+ F32 BMW 435i - Coupe
    2014+ F33 BMW 435i - Convertible
    2014+ F36 BMW 435i - Gran Coupe
  • Part #: TMS216177
    Price: $2399.00 (USD) 
    Free Shipping Free Shipping
    OS Giken Limited Slip Differential Fluid - 80w-250 - 1 liter The OS Giken Super Lock LSD Gear Oil 80W-250 1 Liter FR is the OS Giken's very own special blend of gear oil which does an excellent job of lubricating and protecting your Super Lock LSD from failure. Through use of this high quality liquid, your Super Lock LSD will last much longer if regular oil changes are performed.

    Type: FULL SYNTHETIC
    SAE: 80W-250
    API: GL-5
    Flash point: 208℃
    Viscosity: 320.5(40℃), 43.7(100℃)
    Part #: OS250R
    Price: $49.95 (USD) 
    Quantity:   
    M Performance Limited Slip Differential - F30 335i, F32 435i

    For the ultimate in track day performance, the M Performance Limited Slip Differential is here! The clutch-type mechanical differential features a 30% lockup on acceleration and 9% lockup on deceleration. The differential works with the existing DSC system to provide excellent traction wet or dry. It uses the stock 3.15 final drive ratio that the stock F30 335i / F32 435i uses, so fuel economy will not be affected.

    This item fits the following BMWs:
    2012+ F30 BMW 335i - Automatic Sedan
    2013+ F32 BMW 435i - Automatic Coupe
    2013+ F33 BMW 435i - Automatic Convertible

    Part #: 33107555607
    Price: $1939.20 (USD) 
    Quantity:   
    ECS Magnetic Differential Oil Drain Plug You use a magnetic drain plug for your engine oil, right? Why not apply the same proactive thinking to the differential too? This is a direct replacement magnetic differential drain plug for your BMW. It will catch and retain fine and larger metal particles in your diff oil. If you're proactive in your diff oil servicing, you will catch a minor issue long before it becomes a headache. Diff drain plug includes one sealing o-ring.
    Part #: 009314ECS01A
    Price: $19.95 (USD) 
    Quantity:   
    Differential Drain Plug with O-Ring - Most BMWs 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

    Part #: 33117525064
    Price: $6.44 (USD) 
    Quantity:   
    AC Schnitzer Performance Limited-Slip Differential - F22 F30 One of the best upgrades available to your vehicle is a limited-slip differential. Once your car has power, it's important to make sure you can us it. It's easy to overlook the differential when planning your car's upgrades but it's one of the best areas to get return from your modification spending. Using a shorter (numerically higher) gear ratio will give you better acceleration and the limited slip effect will help get that power to the pavement. Changing the limited slip lock-up will change how the car behaves in corners - low lock-up will introduce more wheel spin; a higher lock-up will give more grip to the rear wheels but may induce an understeer condition (too much power pushing the car straight); a variable lock-up will give you the optimum balance. AC Schnitzer's years of racing experience, car prep, and manufacturing will ensure you get the ideal differential for your specific driving needs. 
    Part #: 331010320
    Price: $3995.00 (USD) 
    Quantity:   
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