Pure Drivetrain 8HP76 High Performance Transmission Hard Parts Kit - AWD - Stage 2
Once an xDrive BMW with the ZF 8HP76 is making well past factory power, the transmission usually tells you first. A G80 M3 Competition xDrive, an F90 M5 or an F95 X5 M with a bigger turbo setup and ethanol will start to flare on the 2-3 or 3-4 upshift at full boost, or the revs will climb in 5th and 6th while road speed lags behind. That is clutch packs running out of holding capacity, not a bad tune, and more pressure alone only buys time. The Pure Drivetrain Solutions 12-85-2000 is the Stage 2 hard parts kit for the all-wheel-drive 8HP76, built for the owner who is about to open the case and wants the internals to stop being the limit.
The 8HP76 is the third-generation 8HP, introduced in 2018 and rated by ZF at 760 Nm of input torque. Like every 8HP it gets eight forward speeds from four planetary gearsets and only five shift elements: two brakes (A and B) and three rotating clutches (C, D and E). Three elements are applied in every gear, so each clutch pack is working in most of the gears you drive in. When one pack starts to slip at high torque, it shows up across several gears at once, which is why these builds rarely fail one shift at a time.
The published description for this part number lists the pieces that give up first when power doubles: a billet input shaft, an intermediate shaft specific to the AWD layout, reinforced clutch pistons for higher apply force, and heavy-duty drum assemblies and clutch hubs. Pure's HPK line is built around its FSR friction plates and C6X steels, and the Stage 2 level is aimed at builds over 1000 wheel horsepower. No core is required. Because this is the AWD version, it is matched to transmissions that drive a transfer case for xDrive; do not substitute the RWD kit.
Rule out the cheap causes first. Check the fluid level the way ZF specifies, with the engine running and the fluid between 30 and 50 C, because a low 8HP slips exactly like a worn one. Look for leaks at the pan and the cooler line connections, read the transmission control module for stored faults and adaptation values, and log slip on a pull with a tool that shows input and output speed. Our ZF8HP common problems and fixes guide covers the fluid, valve body and solenoid faults that can mimic clutch wear, and the BMW shift problems guide walks through the software and adaptation issues BMW has published bulletins on.
This kit is for the ZF 8HP76 in all-wheel-drive form only. Reference listings of 8HP76 applications include the BMW M3 (G80/G81), the M5 (F90) from its later production, the M8 (F91, F92, F93), the X5 M (F95), the X7, and the M340d xDrive and M440d xDrive. Some of these models used the 8HP75 in earlier production, and the F90 M5 appears under both, so the model name alone is not enough. Read the ZF type plate on the transmission case and confirm it is an 8HP76 before ordering. If you are unsure, send us the year and VIN and we will check it. You can browse every 8HP part we carry on the ZF 8HP transmission parts page.
This is a full teardown job for a builder who already knows the 8HP. Measure clutch pack clearances as each pack is assembled rather than assuming stack heights, and inspect the valve body and mechatronic sleeve seals while the unit is apart, since a leaking sleeve or worn bore will undo the strength gained here. Fit a new 8HP pan and filter kit on reassembly so you are not reusing a filter full of old friction material. Refill with ZF LifeguardFluid 8 and set the level hot through the fill plug until it trickles out. Clear the old adaptation values and complete the adaptation drive before any hard runs, and plan your transmission calibration with your tuner, because the control unit still sets the pressure each clutch sees. If the car has a rear-drive sibling in your fleet, the 8HP76 RWD Stage 2 kit is the matching part for that layout.
| Brand | Pure Drivetrain Solutions |
| Part number | 12-85-2000 |
| Fits | Pure Drivetrain 8HP76 High Performance Transmission Hard Parts Kit - AWD - 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.
No. 12-85-2000 is the AWD version of the 8HP76 kit for xDrive transmissions. Rear-drive cars need the RWD kit, 12-86-2000.
Read the ZF type plate on the side of the transmission case. Several BMW M models switched from the 8HP75 to the 8HP76 during production, so the model name alone does not settle it. Send us your year and VIN if you want us to check.
It is a hard parts kit built around Pure's FSR frictions and C6X steels with the upgraded shafts, pistons, drums and hubs. Confirm the full packing list against your teardown before you start, and plan on a fresh pan and filter assembly at reassembly.
ZF LifeguardFluid 8. ZF's data sheet states only LifeguardFluid 8 or 9 may be used in the 8HP, and the level is set with the engine running and the fluid between 30 and 50 C.
Clear the adaptations and run the adaptation drive at minimum. For builds at the power level this kit targets, most owners pair it with a transmission calibration so clutch pressures and shift timing match the new hardware.
