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F3X 335i/435i Manual Limited Slip and Gearing Differential Upgrade

Mfg Part #
TMS216177
Turner Part #
T#340310
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2399.00
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Product Details

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
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    Kit Configurator

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    Add REM bearing polish?

    Add ring & pinion polish?

    Core Charge

    Limited Slip Options

    Select your gear ratio:

    Base Differential

    This Part Fits the Following BMWs

    Make Model Submodel Engine
    BMW F30 335i N55 3.0L
    BMW F32 435i N55 3.0L
    BMW F33 435i N55 3.0L
    BMW F36 435i N55 3.0L
    *The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.
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