BMW Transmission Parts for BMW E21 320i M10 1.8L

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Looking for parts for your BMW automatic transmission or manual transmission? You'll find many of the parts available to service your BMW's transmission here. While internal transmission servicing and rebuilding should be done by professionals, there are a lot of things on the outside of the transmission that you can service or replace yourself. These include gearbox seals, o-rings, gaskets, automatic transmission filters, backup light switches, mounting bolts, flanges, collar nuts, screw plugs, Mechatronics, and more.

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Bav Auto Differential, Transfer Case, Transmission Oil-Pan Wrench
Bav Auto Differential, Transfer Case, Transmission Oil-Pan Wrench ...
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Bav Auto Tools - Corporate Logo
T#:580353
Part#: B8800025
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05-03-2026

$ 24.74 USD
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$ 32.99

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The proper size for removing BMW drain plugs.
Pentosin ATF 8 Automatic Transmission Fluid - 1 Liter - BMW 8HP Transmissions
Pentosin ATF 8 Automatic Transmission Fluid - 1 Liter - BMW 8HP Trans...
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T#:45963154
Part#: 1058110
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04-28-2026

$ 23.92 USD
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Transmission fluid is responsible for both cooling and lubricating sensitive transmission components. Over time, this fluid becomes contaminated by particulate from clutch and gear components wearing down. This contamination reduces the fluid's ability to act as a lubricant, eventually leading to increased wear and tear within the transmission. To prevent excess wear and keep your transmission in top shape, the fluid and filter should be replaced regularly. As per ZF's recommendations, we suggest performing a full service on your 8HP automatic transmission every 50,000 miles. If your vehicle has been modified to produce more power than stock or if it is regularly track-driven, we recommend shorter 30,000-mile service intervals. This will ensure your transmission's fluid is free from contamination, which will help extend the life of internal transmission components, such as clutch packs and solenoids.
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Genuine BMW Reverse Light Switch
Genuine BMW Reverse Light Switch
For vehicles with production dates up to 09/1979
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Genuine BMW - Corporate Logo
T#:368003
Part#: 23141354071
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Sale - Save 7% $ 36.99

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

$ 34.23 USD
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$ 36.99

This product was last offered at the strikethrough price on
06-15-2026

$ 34.23 USD
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Pentosin ATF 8 Automatic Transmission Fluid - 5 Liters - BMW 8HP Transmissions
Pentosin ATF 8 Automatic Transmission Fluid - 5 Liters - BMW 8HP Tran...
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Pentosin - Corporate Logo
T#:45997487
Part#: 1058210
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Sale - Save 9% $ 113.99

This product was last offered at the strikethrough price on
04-28-2026

$ 104.22 USD
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$ 113.99

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Genuine BMW Copper Washer - 16 X 22 X 1.5 mm - Cooling Line Fitting at Transmission - E28
Genuine BMW Copper Washer - 16 X 22 X 1.5 mm - Cooling Line Fitting a...
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Genuine BMW - Corporate Logo
T#:28589
Part#: 07119963276
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Sale - Save 25% $ 1.99

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$ 1.49 USD
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$ 1.99

This product was last offered at the strikethrough price on
06-25-2026

$ 1.49 USD
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Genuine BMW Gasket Ring -
This item fits the following BMW Chassis:
E30

Bav Auto Transmission 17mm Drain Plug Wrench - Manual Transmission
Bav Auto Transmission 17mm Drain Plug Wrench - Manual Transmission ...
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Bav Auto Tools - Corporate Logo
T#:580447
Part#: B8800142
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$ 14.99 USD
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Makes changing your transmission fluid an easy task. 1/2 " drive, for use in BMWs with 17mm female allen transmission drain plugs.
Pentosin Super DOT4 Brake Fluid - 1 Liter
Pentosin Super DOT4 Brake Fluid - 1 Liter
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Pentosin - Corporate Logo
T#:348645
Part#: BF1P4
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06-29-2026

$ 18.99 USD
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Boiling Point - Dry 265°C (509°F) / Wet >165°C (329°F)
Rein Selector Rod Shaft Seal - E12, E21, E23, E24, E28
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
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Sale - Save 5% $ 4.07

This product was last offered at the strikethrough price on
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$ 3.87 USD
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$ 4.07

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10x18x5mm seal - stop leaks in their tracks
Rein TRANSMISSION SEAL (40X58X10) - E12, E21
Rein TRANSMISSION SEAL (40X58X10) - E12, E21
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T#:19834
Part#: 24111207426
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$ 13.29 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. For front wheel drive vehicles equipped with manual transmissions only.
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OEM Rein Transmission Input Shaft Seal - E12 E21 E23 E24 E28 E30 E31 E32 E34 E36 E38 E39 E52 E53
OEM Rein Transmission Input Shaft Seal - E12 E21 E23 E24 E28 E30 E31 ...
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T#:379685
Part#: 24311422671
Ships in 3 Business Days
Sale - Save 5% $ 10.99

This product was last offered at the strikethrough price on
06-29-2026

$ 10.44 USD
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$ 10.99

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$ 10.44 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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Pentosin ATF 9 Automatic Transmission Fluid - 1 Liter
Pentosin ATF 9 Automatic Transmission Fluid - 1 Liter
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Pentosin - Corporate Logo
T#:46134785
Part#: 1058111
Special Order: No Guaranteed ETA
Sale - Save 6% $ 31.99

This product was last offered at the strikethrough price on
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$ 30.11 USD
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Pentosin ATF9 is specially developed with reduced viscosity to optimize the performance of the latest generation 8 and 9-speed ZF automatic transmissions. Pentosin ATF 9 has been developed to deliver outstanding friction control to ensure excellent shifting performance.
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Pentosin ATF 9 Automatic Transmission Fluid - 5 Liters
Pentosin ATF 9 Automatic Transmission Fluid - 5 Liters
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Pentosin - Corporate Logo
T#:46134786
Part#: 1058211
Special Order: No Guaranteed ETA
Sale - Save 5% $ 139.99

This product was last offered at the strikethrough price on
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$ 132.59 USD
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$ 139.99

This product was last offered at the strikethrough price on
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$ 132.59 USD
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Pentosin ATF9 is specially developed with reduced viscosity to optimize the performance of the latest generation 8 and 9-speed ZF automatic transmissions. Pentosin ATF 9 has been developed to deliver outstanding friction control to ensure excellent shifting performance.
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