8HP70 Valve Body, remanufactured and ready to install. Fits the 8HP70. Ships fast from the USA.
The ZF 8HP70 is the higher-torque member of the same eight-speed family, built into the V8- and diesel-powered versions of vehicles that also run the lighter 8HP45: BMW 5 Series and 7 Series, X5 and X6, Audi Q7 and A8, Jeep Grand Cherokee SRT and Trackhawk, Dodge Durango SRT, Chrysler 300 SRT, and Ram 1500 trucks with the 5.7L Hemi or 3.0L EcoDiesel. A transmission sized for that much torque puts real heat and clamping load through its clutch packs, and the valve body is what meters the pressure doing that clamping - when it wears, the result is usually a burned clutch rather than a clean, easy slip. This listing is the bare 8HP70 casting, the hydraulic plate itself, without a solenoid pack installed.
Like every 8HP transmission, the 8HP70 has no mechanical fail-safe behind its valve body. The transmission control module fires solenoids bolted to this casting, and those solenoids move spool valves through precision bores to apply and release each clutch pack in the sequence that produces every gear change. The 8HP70's bores and clutch-apply circuits are sized for substantially more torque than the 8HP45, which is why the wear pattern on this specific casting skews toward a burned A clutch rather than the shift-quality complaints more common on the lighter unit.
Sonnax's own technical bulletin on A clutch burnup traces the failure across the whole ZF8/845RE/850RE family to the factory backing plate flexing during apply, which wears the clutch pack unevenly and builds heat the valve body can no longer regulate once its own bores wear alongside it. Our ZF8HP valve body wear and bench-fix guide covers telling that wear pattern apart from a straightforward mechatronic sleeve leak, and our ZF8HP common problems and fixes guide covers the broader code list this family throws before it reaches limp mode.
This valve body is built to the 8HP70 casting used in the higher-torque applications listed above. It does not interchange with the lighter 8HP45 valve body used in the four- and six-cylinder versions of the same vehicle lines, so confirm your transmission code or VIN rather than ordering by model name alone - BMW, Jeep and Ram all sell both torque ratings under the same nameplates. The ZF 8HP parts collection carries the 8HP45 and other torque-rated versions if yours turns out to be a different member of the family.
Drop the pan and filter and disconnect the internal harness before pulling the old valve body, then torque the new one down in the factory crossing sequence so the separator plate and check balls seat correctly. Refill with ZF LifeGuard 8 fluid only, with no additives, and run the adaptive relearn afterward under a mix of light and hard-throttle shifts so the module recalibrates clutch fill times against the fresh bores. If the A clutch was already burned, pair this with a fresh 8HP70 clutch drum rather than reusing the damaged one, and a deep cast aluminum pan adds cooling capacity that reduces the heat driving this same failure.
| Fits | 8HP70 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No, this is the bare 8HP70 casting without a solenoid pack. Our ZF8HP solenoid kit is sold separately if yours needs replacing too.
A documented ZF8HP/845RE/850RE failure where the factory A clutch backing plate flexes during apply, wearing the clutch pack unevenly and building heat that damages the valve body bores alongside it.
V8 and diesel applications including BMW 5 and 7 Series, X5 and X6, Audi Q7 and A8, Jeep Grand Cherokee SRT and Trackhawk, Dodge Durango SRT, Chrysler 300 SRT, and Ram 1500 with the 5.7L Hemi or 3.0L EcoDiesel.
No. The 8HP45 is a lighter-duty casting used behind four- and six-cylinder engines in the same vehicle lines and does not interchange with the 8HP70.
ZF LifeGuard 8 ATF only, with no additives.
This is an OEM remanufactured valve body with a 1-year warranty.
