BMW Drivetrain Parts for BMW Z4 M Roadster S54 (2003-2008)

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Building your perfect BMW is more than just adding horsepower and stiff suspension. Your drivetrain needs attention in order to deliver power effectively. Most BMWs feature comfortable clutch discs, heavy flywheels, long shifter throws, and open differentials. The drivetrain transmits power to the wheels, but can also be a source of power loss when it is designed for comfort rather than performance. Everything on this page will help you improve your power delivery and driving experience by providing custom Limited Slip Differentials, Short Shift Conversions, Performance Clutch Discs, Lightweight Flywheels, and anything else your BMW needs to be the perfect driving experience.

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ECS - Corporate Logo
T#:366828
Part#: 009314ECS01A
In Stock
Sale - Save 35% $ 58.99
$ 38.34 USD
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Sale - Save 35% $ 58.99
$ 38.34 USD
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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. Direct replacement for Genuine BMW part number(s): 33117525064, 33110308370, 33110152626
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ECS Brass Clutch Pivot Pin - Many BMWs
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ECS - Corporate Logo
T#:364033
Part#: 013236ECS01A
In Stock
Sale - Save 40% $ 69.99
$ 41.99 USD
Free Shipping on orders $49 and up
Sale - Save 40% $ 69.99
$ 41.99 USD
Free Shipping on orders $49 and up
This brass clutch pivot pin is an upgrade over the stock plastic pivot pin. The brass pin will last a lot longer than the plastic piece and may save you time and hassle later on. The original plastic pivot pin is known to fall out, snap, or just wear out over time. At the least you get a very annoying squeak every time you depress the clutch. In a worse case scenario, the clutch fork won't be able to push on the throw-out bearing and your clutch will be useless. The only time to replace the clutch pivot pin is when the transmission is removed, so this brass upgrade can be installed during clutch replacements or a rear main seal service.
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Bavarian Autosport - Corporate Logo
T#:1135777
Part#: 26112226527
Ships on Aug 11, 2025
Sale - Save 25% $ 71.99
$ 53.99 USD
Free Shipping on orders $49 and up
Sale - Save 25% $ 71.99
$ 53.99 USD
Free Shipping on orders $49 and up
This Bav Auto replacement flex disc (aka: the guibo) is a vibration dampener mounted on the back of the transmission which connects to the driveshaft. When it has worn, it can produce knocking sounds and a terrible vibration throughout the car. It's especially noticeable at low speeds and when starting from a standstill. Oil leaking from the back of the transmission will significantly reduce its life. This can also be used as an upgrade on the E30 M3. It has much more rubber in between the bolt holes which makes it last longer. This is 5mm thicker than the stock E30 flex disc so adjustment of the 2-piece driveshaft may be required. The original flex disc bolts can be re-used.
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E46 M3, Z4M Performance Polyurethane Differential Bushing Set ...
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ECS - Corporate Logo
T#:378193
Part#: 002447ECS03KT
In Stock
Sale - Save 35% $ 189.99
$ 123.49 USD
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Sale - Save 35% $ 189.99
$ 123.49 USD
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Worn rubber differential mounts will lead to the differential twisting and shifting around in the rear subframe. Not only will this be noisy but it's bad for driver confidence and bad for the chassis as well. Even on fresh rubber bushings the differential has deflection and twist, especially if the car has been modified for more torque. Since the differential is centrally mounted in the rear subframe, with all suspension mounts interconnected, a differential with too much deflection will affect handling and could even damage the rear subframe.

These 88A urethane E46 M3 diff mounts are much stiffer than stock but still not as solid as our Turner aluminum/Delrin bushings. This set will resist twisting much better than the stock rubber mounts. Included is the front diff mount and two rear mounts in the cover.

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ECS - Corporate Logo
T#:348998
Part#: 002447ECS01
In Stock
Sale - Save 35% $ 142.99
$ 92.94 USD
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Sale - Save 35% $ 142.99
$ 92.94 USD
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Revitalize your driving experience with ECS Tuning's In-House Engineered Performance Polyurethane Differential Bushings. Say goodbye to soft factory rubber bushings and their deflection. These innovative bushings provide a substantial improvement in the connection between your right foot, the chassis, and the wheels. The outcome is a crisper power transfer from the differential to the wheels, resulting in enhanced throttle control for various driving activities. Notably, these polyurethane bushings achieve these benefits without the harshness or vibration often linked to delrin or solid differential mounts.

Manufactured using a robust 88A durometer polyurethane and a black anodized 6061-T6 aluminum sleeve, these bushings offer superior resistance to chemicals, ozone degradation, road salt, and general wear and tear. This translates to an extended service life.

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ECS - Corporate Logo
T#:363116
Part#: 002447ECS02
In Stock
Sale - Save 35% $ 62.99
$ 40.94 USD
Free Shipping on orders $49 and up
Sale - Save 35% $ 62.99
$ 40.94 USD
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Enhance your driving experience with ECS Tuning's Performance Polyurethane Differential Bushings. These meticulously engineered bushings offer a direct connection between your right foot, the engine, and the chassis, making them an essential upgrade.

  • Say goodbye to the softness of factory rubber differential bushings that absorb vibrations and reduce performance.
  • ECS Tuning's polyurethane bushings eliminate the deflection found in factory rubber bushings, resulting in improved power transfer from the differential to the wheels.
  • Experience enhanced throttle control, whether you're navigating a challenging canyon road, drag racing, or simply commuting.

Unlike delrin or solid differential mounts, these bushings deliver improved performance without introducing harshness or excessive vibration.

Crafted from durable 88A durometer polyurethane and enhanced with a black anodized 6061-T6 aluminum sleeve.

Resistant to chemicals, ozone degradation, road salt, and general wear and tear, ensuring a longer service life.

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Delrin Shifter Carrier Bushing Kit (Ultra Oval)
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ECS - Corporate Logo
T#:389302
Part#: 017367ECS01AKT
In Stock
Sale - Save 25% $ 79.99
$ 59.99 USD
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Sale - Save 25% $ 79.99
$ 59.99 USD
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Shifter slop is a common complaint among all BMW models. Some of that play comes from the bushings where the shifter carrier mounts to the transmission. The original rubber carrier bushings don't last very long and when they get too soft the shifter flops around. These Delrin bushings have almost no deflection and will last much longer than the factory rubber, giving you precise shifting for many years.

Note: this is only one part of the shift linkage and there may be other components that need replacing to improve shifting feel.

New carrier bushing pins are included.

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ECS Aluminum Magnetic Manual Transmission Drain Plug - Priced Each (M...
10X Entries For Our Spin To Win Sweepstakes! For vehicles with manual transmission only
ECS - Corporate Logo
T#:638794
Part#: 005960LA01
In Stock
Sale - Save 25% $ 47.99
$ 35.99 USD
Free Shipping on orders $49 and up
Sale - Save 25% $ 47.99
$ 35.99 USD
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This is a must-have for ALL BMWs, and simply installs in place of your existing drain plug. With every fluid change you perform on your BMW, you'll be able to inspect for metal shavings and debris. Many times, if something is going wrong on your BMW's transmission, the magnetic drain plug can give you an early warning. Replaces genuine BMW transmission drain plug with gasket ring:23117531356
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Bavarian Autosport - Corporate Logo
T#:639803
Part#: 24341423376
Ships on Sep 5, 2025
Sale - Save 15% $ 28.99
$ 24.64 USD
Free Shipping on orders $49 and up
Sale - Save 15% $ 28.99
$ 24.64 USD
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Remember to service your transmission at the recommended intervals to increase your transmission's life span and reliability! From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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