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BMW Drivetrain Parts for BMW E21 320i M10 1.8L

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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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OEM Rein Magnetic Differential Oil Drain Plug - M22x1.5 - Most BMW & ...

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T#:38890943

Part#: HWU0065

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$ 23.99 USD

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As components in the differential begin to wear, metal particles become loose in the diff fluid, which can lead to excess wear. This magnetic plug pulls these particles out of suspension, helping to reduce wear over time. Replaces BMW # 33117525064

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2002, E21 320i, E30 318i (M10) JB Racing Lightweight Aluminum Flywhee...

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T#:3647

Part#: 520-110-215

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$ 581.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

Modern flywheels are built with additional components and features that are designed to dampen and minimize vibrations from the engine and transmission. As a result they have become bloated in weight and that means more energy is used up just making the flywheel spin. The weight difference between an aluminum and steel flywheel is huge - sometimes more than 50% less. Without the additional mass, more energy can be diverted to where it counts most - moving the car. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines. The dampening effect is just not needed on cars that are focused on performance.

In addition to releasing more power to the wheels, the lighter flywheel allows the engine to spin more freely, which improves throttle response. Again, the difference is huge as you watch the revs build faster than before. With the engine spinning easier the power band comes up much sooner. The stock steel flywheel feels lazy in comparison. There is a driving adjustment required to get used to how much faster the engine revs but that's not really a downside.

The JB lightweight flywheel is designed to be used with a factory organic clutch - the same clutch kit that you would get from any BMW dealer. This makes replacement clutch components easy to source and inexpensive when compared to specialized racing clutches. By using the factory BMW clutch, JB has also made the whole assembly easy to live with when used on the street. The clutch behaves the same as it originally did - just with better throttle response and more power! The JB flywheel can be rebuilt too with a new clutch contact surface.

Aluminum flywheels are considered 'single-mass' flywheels because they do not have the same dampening designs as an original 'dual-mass' flywheel. With a single-mass design more noise and vibration may be noticeable. There are steps you can take to minimize the noise - heavier weight transmission oil and clutch discs with anti-rattle springs (sprung-hub clutch).

Stock Flywheel Weight = 16.5lbs
JB Flywheel Weight = 8lbs

This item fits the following BMWs:
1974-1976 2002 BMW 2002
1977-1983 E21 BMW 320i
1984-1985 E30 BMW 318i

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Rein Driveshaft Center Support Bearing

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T#:379700

Part#: 26121225071

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$ 13.50 USD

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Commonly referred to as "carrier bearing"

OEM Rein Transmission Input Shaft Seal - E12 E21 E23 E24 E28 E30 E31 ...

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T#:379685

Part#: 24311422671

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$ 10.99 USD

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The input shaft seal on your transmission ensures that you will not experience any fluid loss from behind the guide sleeve. If you have a leak, be sure to replace it as soon as possible to avoid losing too much fluid, which can ultimately damage your transmission.

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Rein TRANSMISSION SEAL (40X58X10) - E12, E21

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T#:19834

Part#: 24111207426

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The input shaft seal on your transmission ensures that you will not experience any fluid loss from behind the guide sleeve. If you have a leak, be sure to replace it as soon as possible to avoid losing too much fluid, which can ultimately damage your transmission. For front wheel drive vehicles equipped with manual transmissions only.

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OEM Rein Driveshaft Center Support Bearing - E21 E28 E10 E12 E23 E24 ...

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T#:379750

Part#: 26111206502

Back Ordered

$ 23.99

This product was last offered at the strikethrough price on
06-26-2026

$ 18.99 USD

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Center support bearings help to add some support to the driveshaft in a BMW. Because it is designed to be a two piece system, bracing needs to be added to the center to keep your driveshaft in line and tight. If you are noticing excessive vibration or gear noise in your vehicle, it may be time to replace the support bearing.

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OEM Rein CV Boot Repair Kit - E21 E10

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T#:12274

Part#: 33219067911

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$ 10.99 USD

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This is the OEM Rein rear axle boot kit for the CV joint. The kit includes the boot, clip, clamp, and grease.

Rein Selector Rod Shaft Seal - E12, E21, E23, E24, E28

For vehicles with a production date from 04/1977

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T#:592120

Part#: 24527509500

Ships in 1 Business Day

$ 4.07 USD

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10x18x5mm seal - stop leaks in their tracks

Rein Differential Drain Plug Gasket

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T#:19654

Part#: 07119963355

Ships in 3 Business Days

$ 2.03 USD

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GASKET RING for various sensors and seals.

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