Complete ZF 8HP45 (Chrysler 845RE) valve body with solenoids and oil circuit board for 3.6L V6 Charger, Challenger, 300 and RAM 1500 to cure harsh shifts, slip and limp mode.
Chrysler badges its version of the ZF 8HP45 the 845RE, and this is the complete valve body assembly for it - the eight-speed automatic behind the 3.6L Pentastar V6 in the Dodge Charger and Challenger, Chrysler 300, and Ram 1500. This is the 2WD/rear-drive circuit board version, and it ships complete: the aluminum valve body, the internal shift and pressure-control solenoids, and the oil circuit board that routes line pressure to the clutch packs, all in one assembly rather than a bare casting you have to pair with solenoids separately.
The 845RE's valve body bolts to the bottom of the case under the oil pan and does the actual shifting. The transmission control module fires the shift and pressure-control solenoids mounted on it, and those solenoids move spool valves through the oil circuit board to apply and release each clutch pack for all eight forward gears. Because the solenoids and circuit board are built into this one assembly, a tired unit typically fails as a combination of symptoms rather than one clean complaint - a specific gear shifting harshly alongside a stored solenoid or pressure code is the classic 845RE pattern.
Chrysler's own service bulletin 21-041-14 covers a harsh 2-1 downshift on 2013 Charger and 300 cars with this exact 3.6L/845RE combination, occurring at any transmission temperature - direct factory confirmation that this specific shift complaint traces back to the valve body rather than a sensor or software issue alone.
Scan for codes first and note exactly which gear change is harsh or flared - the 2-1 downshift Chrysler documented is common enough to rule out separately from a general wear pattern. Our ZF8HP common problems and fixes guide covers the fuller code list this platform throws, and our ZF8HP delayed engagement guide is worth checking too if the complaint is a pause before the car moves rather than a harsh shift once it is already rolling.
This assembly is built for the 2WD/rear-drive circuit board used behind the 3.6L Pentastar V6 in the Dodge Charger and Challenger, Chrysler 300, and Ram 1500 - OEM references 8HP45, 845RE, ZF8HP45 and GA8HP45Z all point to the same unit. AWD Chargers and 300s run a different circuit board, so confirm 2WD/RWD against your build sheet or VIN before ordering. The ZF 8HP parts collection carries the AWD circuit board version and the other torque-rated 8HP castings if yours turns out to be a different application.
This is a pan-off job: drop the pan and filter, unplug the internal solenoid harness, remove the old valve body, and set this assembly in place, making sure the manual valve engages the shift shaft and the harness connector seats fully before torquing the mounting bolts down in the factory sequence. Refill with the correct ZF 8HP fluid and a fresh filter rather than reusing the old one, clear the stored codes, and run the transmission's adaptive relearn through a mix of light and moderate throttle shifts so the new solenoids calibrate to your clutch clearances. A ZF8HP pump is worth checking if line pressure was already marginal before the valve body failed, and the Mopar-branded pan, filter and ATF kit covers the service parts this platform shares across Ram, Jeep and Dodge.
| Type | Valve body assembly with solenoids and oil circuit board |
| Transmission | ZF 8HP45 / Chrysler 845RE 8-speed automatic |
| Circuit board | 2WD / rear-drive version |
| Fits | Dodge Charger and Challenger, Chrysler 300, RAM 1500 (3.6L V6) |
| OEM references | 8HP45, 845RE, ZF8HP45, GA8HP45Z |
| Item weight | 14.3 lb |
| Included | 1 valve body assembly |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The complete valve body: the aluminum casting, the internal shift and pressure-control solenoids already installed, and the 2WD/rear-drive oil circuit board.
845RE is Chrysler's own designation for its application of the ZF 8HP45 eight-speed automatic. They're the same transmission; 8HP45 is the ZF part family name and 845RE is how Mopar badges it.
No. This is the 2WD/rear-drive circuit board version. AWD Chargers and 300s use a different circuit board, so confirm 2WD/RWD against your build sheet or VIN before ordering.
Harsh or banged-in engagement, a harsh or flared downshift (Chrysler's bulletin 21-041-14 documents a 2-1 downshift specifically), slipping on a specific upshift, or limp mode with a stored solenoid or pressure code.
Clear stored codes and run the adaptive relearn through a mix of light and moderate throttle shifts so the new solenoids calibrate to your clutch clearances.
This is a remanufactured valve body assembly with a 1-year warranty.
