Pure Drivetrain 8HP51 High Performance Transmission Hard Parts Kit - RWD - Stage 2
Ask anyone running a big-turbo Toyota Supra A90 or a heavily tuned BMW Z4 M40i what failed first, and the answer is often the ZF 8-speed. These cars use the rear-drive version of the third-generation ZF 8HP51, coded GA8HP51Z, and the B58 engine in front of it can be pushed well past the torque the factory clutch packs were sized for. The Pure Drivetrain Solutions 12-95-2000 is the Stage 2 hard parts kit for that rear-drive 8HP51: the replacement clutch and hub content you install while the transmission is apart, so it can hold the power the rest of the build makes.
The 8HP has no bands. It uses two brakes and three multi-plate clutches, and each gear applies two of them while the other three stay open. Under a lot of torque the stock paper frictions and steels are the first thing to give up, followed by the hubs that carry them. This kit swaps in Pure Drivetrain FSR friction plates, C6X steels and pressure plates, plus billet 7075 aluminum hubs that are heat treated and hard anodized. Pure Drivetrain says its hub design opens up extra oil paths through each hub for better fluid distribution and cooling, strengthens the tooth profiles on the clutch packs and the parts they mate with, and lengthens the base shoulder that backs up the clutch base plates. Stage 2 is the stronger of the two stages the company sells for this case.
Low fluid is the cheapest explanation for a slipping 8HP and it is common after any previous pan service that was not filled to the ZF procedure. Check the level hot, in the correct temperature window, before anything else. Then read the transmission module for faults and record the adaptation values. If the unit only misbehaves on hard pulls with a correct fluid level and no hydraulic faults, the clutches are the likely limit. Read our ZF8HP common problems and fixes guide for the full list of failures, and the pressure control solenoid symptoms guide before you spend money on clutches that might not be the problem.
This listing is the RWD 8HP51. Pure Drivetrain lists the Gen 3 8HP51 in G-series BMWs from 2018, including the G20 3 Series, G22 4 Series and G29 Z4, along with the Toyota Supra MKV (A90) from 2019 and the Jaguar XE. Many of those BMW models were also sold with xDrive, and xDrive cars use the GA8HP51X, which needs the 8HP51 AWD Stage 2 kit instead. Some six-cylinder diesel G-series cars carry an 8HP76 rather than an 8HP51; for that case see the 8HP76 RWD Stage 2 kit. Pull the ZF tag reading from the case and send it with your year and VIN; Pure Drivetrain requires fitment to be confirmed before any HPK order. More 8-speed parts are on the ZF 8HP collection page.
| Brand | Pure Drivetrain Solutions |
| Part number | 12-95-2000 |
| Fits | Pure Drivetrain 8HP51 High Performance Transmission Hard Parts Kit - RWD - Stage 2 |
| Type | Transmission Rebuild Kits |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Pure Drivetrain lists the Supra MKV among Gen 3 8HP51 applications, and the Supra is rear drive, which matches this RWD kit. Send your VIN and case tag reading to confirm before ordering.
No. xDrive cars use the AWD GA8HP51X. Order the AWD Stage 2 kit, part number 12-94-2000, after confirming your tag.
No. It is the performance hard parts: FSR frictions, C6X steels and pressure plates, and billet 7075 hubs. Seals, gaskets, filter and fluid are bought separately.
A tune can help healthy clutches hold more, but it cannot restore glazed or burned frictions. If the pack is already worn, the clutches have to be replaced.
Use a known-good calibration, reset adaptations, run the quick learn and drive 500 miles of stop-and-go, cycling through the gears, before full-power use.
