8HP45 Valve Body, remanufactured and ready to install. Fits the 8HP45. Ships fast from the USA.
The ZF 8HP45 is the entry point into ZF's eight-speed automatic lineup, installed behind the four- and six-cylinder engines in the BMW 3 Series and 5 Series, Jaguar XF and XJ, Land Rover Range Rover Sport and Evoque, and - under Chrysler's own 845RE badge - the Jeep Grand Cherokee, Ram 1500 and the 3.6L Pentastar Charger, Challenger and 300. If one of these is shifting harsh, slipping between gears, or has dropped into limp mode with a stored pressure or solenoid code, the valve body bolted under the pan is almost always where the problem starts. This listing is the bare casting itself: the plate of precision bores, spool valves and check balls that does the hydraulic work, without a solenoid pack installed, for a vehicle whose solenoids have already tested good and just needs fresh bores underneath them.
Every ZF 8HP transmission skips the old accumulator-spring and band-logic hydraulics of earlier automatics for a fully electronic valve body. The transmission control module fires the shift and pressure-control solenoids, and those solenoids move spool valves inside this casting's bores to route line pressure to the correct clutch pack for each of the eight forward gears. On the 8HP45 specifically, the bores and clutch-apply circuits are sized for the lower torque ceiling of the four- and six-cylinder engines it backs, a lighter-duty casting than the 8HP70 and 8HP90 used behind the V8 and diesel versions of these same vehicle lines.
Bore and sleeve wear at the main pressure regulator is the most common failure Sonnax documents across the whole 8HP45/8HP70/845RE family, and it bleeds fluid past the valve until line pressure drops across the entire unit - fresh fluid and a filter change alone do not fix that kind of wear. Our ZF8HP common problems and fixes guide walks through separating a worn valve body from a failing pressure-control solenoid, and our pressure control solenoid symptoms guide covers the specific test to run before deciding between this bare casting and a version with solenoids already installed.
This valve body is built to the 8HP45 casting shared across BMW, Jaguar, Land Rover and the Chrysler 845RE-badged applications. ZF's 8HP family is split by torque rating, and the 8HP45 casting does not interchange with the 8HP70 or 8HP90 used in higher-output versions of the same vehicles, so match your transmission code or VIN before ordering rather than going by engine size alone. The ZF 8HP parts collection carries the other torque-rated versions if yours turns out to be a different member of the family, and if your solenoids have not been tested yet, our 8HP45 valve body with solenoids is the safer order.
Drop the pan and filter, disconnect the internal harness, and pull the old valve body before this one goes in - debris left in the case from the worn unit is the single biggest cause of a comeback. Torque the mounting bolts down in the factory crossing pattern so the separator plate and check balls stay seated, refill using the ZF 8HP fluid and filter service kit fluid only, with no additives, and run the transmission control module's adaptive relearn afterward through a mix of light and moderate throttle shifts so it recalibrates clutch fill times against the fresh bores.
| Fits | 8HP45 |
| 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 casting - the bores, spool valves and check balls - without a solenoid pack installed. If your solenoids have not been tested, order our 8HP45 valve body with solenoids instead.
BMW 3 Series and 5 Series, Jaguar XF and XJ, Land Rover Range Rover Sport and Evoque, and under Chrysler's 845RE badge the Jeep Grand Cherokee, Ram 1500, and the 3.6L Pentastar Charger, Challenger and 300.
Harsh, late or flared shifts, slipping or gear hunting, torque converter clutch shudder at cruise, or limp mode with a stored pressure or solenoid code.
No. The 8HP70 and 8HP90 are higher-torque castings used in V8 and diesel versions of the same vehicle lines, and they do not interchange with the 8HP45.
ZF LifeGuard 8 ATF only, with no additives.
This is an OEM remanufactured valve body with a 1-year warranty.
