Compare BMW 8HP45, 8HP50, 8HP70 and 8HP75 transmissions for repairs, used parts buying and swap planning in Australia.
BMW 8HP names look simple until you are standing in front of two gearboxes with different bellhousings, converters, cooler ports and output arrangements. This guide is a buyer-first overview for Australian BMW owners, workshops and builders.
Quick comparison
| Variant | Typical role | Buyer note |
|---|---|---|
| 8HP45 | Earlier/lower torque BMW applications | Useful for factory replacement when matched correctly; do not assume it suits high-torque swaps. |
| 8HP50 | Later medium-duty applications | Often discussed for B48/B58-era cars; confirm generation and bellhousing. |
| 8HP70 | Higher torque applications | Popular for N57/M57 and performance swap conversations; verify RWD/xDrive and converter. |
| 8HP75 | Later/heavier-duty applications | Often linked to newer B57/B58/S58-era donor discussions; matching electronics and hardware matters. |
Fitment is not just the number
An “8HP70” is not automatically interchangeable with every other 8HP70. BMW donor engine, chassis, generation, bellhousing pattern, converter, oil cooler ports, output flange, xDrive arrangement and electronics can change the parts you need.
For factory BMW repair
- Prioritise VIN match and the exact original transmission code.
- Check if your workshop can code/adapt the replacement unit.
- Buy the converter and mechatronics condition with eyes open.
- Ask for warranty/return terms on large drivetrain parts before purchase.
For 8HP swaps
- Start with your engine bolt pattern and controller plan.
- Confirm adapter kit compatibility before buying the gearbox.
- Budget for shifter, wiring, cooler, driveshaft, mounts and fluid service.
- Photograph every tag, plug, flange and port before you order supporting parts.
Need a BMW 8HP transmission, shifter, mechatronics, converter, cooler lines or matching BMW parts?
MPerformance.parts supplies used OEM BMW parts from dismantled Australian vehicles. Send your VIN, part number and photos so the team can check fitment before you buy.
Request a BMW part · Search 8HP parts · Identify a BMW 8HP · Engine/transmission policy
Useful MPerformance.parts links: Used BMW Parts Australia · BMW Dismantlers Australia · Contact.
Fitment guidance is general. BMW changed hardware across models and build dates, so confirm by VIN, part number and photos before ordering.