Replacement 42RLE valve body with solenoid block, OE 5078327AA, for Jeep and Dodge units with harsh shifts, slipping, or P0750-P0775 codes.
If a Jeep Wrangler, Liberty, or Grand Cherokee, a Dodge Dakota, Nitro, Durango, Charger, or Challenger, a Chrysler 300, or a Mitsubishi Raider built on the Chrysler 42RLE is hitting hard into 1-2, missing or delaying the 2-3 shift, slipping under throttle, downshifting hard into first, or stuck in limp mode with a solenoid circuit code in the P0750-P0775 range, the valve body and solenoid block assembly is almost always the part behind it. This replacement carries the Chrysler/Mopar OE reference numbers 5078327AA and RL078327AA.
The 42RLE is a four-speed, rear-wheel-drive electronic automatic that Chrysler built off the same hydraulic architecture as the front-wheel-drive 41TE/A604. The valve body is the transmission's hydraulic brain - it routes line pressure through machined aluminum bores and spool valves to apply each clutch pack in sequence - and the solenoid block bolted to it carries the shift and pressure control solenoids, plus the pressure switches, that the transmission control module reads and commands to time every shift. Those pressure switches and solenoids are usually the first thing to fail, but worn valve bores underneath them bleed off the line pressure the solenoids are trying to control, which is why swapping solenoids alone on a high-mile unit often puts the same code right back within a week.
Because the 42RLE shares its hydraulic architecture with the 41TE/A604, the same diagnostic logic applies: a Clutch Volume Index self-test can point at a worn clutch pack instead of the valve body, and a pressure-regulator bore that has worn oversize produces low line pressure and burnt clutches that look like a solenoid fault. Our 41TE/A604 Ultradrive problems guide covers how CVI testing works on this shared architecture, and our slipping-under-load guide covers pressure-regulator bore wear - both are worth ruling out before you spend on a replacement valve body.
This assembly carries OE reference numbers 5078327AA and RL078327AA and covers the 42RLE as used in the Jeep Wrangler, Liberty, and Grand Cherokee, the Dodge Dakota, Nitro, Durango, Charger, and Challenger, the Chrysler 300, and the Mitsubishi Raider. Chrysler changed the 42RLE valve body and solenoid pack more than once across the production run and the bodies are not interchangeable across every year, so match the number stamped on your old body against this listing before ordering rather than going by vehicle and year alone. See our 41TE/A604 family parts hub for related diagnostic guides and components built on the same architecture.
This goes in with the transmission still in the vehicle: drain and drop the pan, pull the filter, unplug the solenoid connector at the case, remove the valve body bolts, and lower the assembly out, keeping track of the manual valve linkage and park rod as they come free. Fit a new filter and pan gasket while it is out - our 42RLE filter and pan gasket kit covers that - and refill with ATF+4 only. Torque the bolts down evenly in a crossing pattern rather than corner to corner; the 42RLE is pressure-sensitive, and a body that is not torqued flat will cross-leak between circuits and hand you a fresh set of shift complaints. Clear the stored codes and run the relearn on the road rather than driving it normally. If the unit has significant miles on it, inspect the 42RLE clutch drum while the pan is down, since drum and clutch wear on a high-mile 42RLE can produce the same slip and harsh-shift complaints as a tired valve body. This is a professional-level install - if you are not set up to do it on a lift with the fluid handled properly, have a shop install it.
| Type | Replacement hydraulic valve body with solenoid block |
| Transmission | Chrysler 42RLE (4-speed RWD electronic) |
| OE reference numbers | 5078327AA, RL078327AA |
| Fitment | Jeep Wrangler, Liberty, Grand Cherokee; Dodge Dakota, Nitro, Durango, Charger, Challenger; Chrysler 300; Mitsubishi Raider - verify casting number |
| Includes | Valve body, solenoid block, separator plate |
| Body material | Machined aluminum |
| Fluid | ATF+4 |
| Item weight | 10.41 lb |
| Package dimensions | 12.99 x 12.4 x 11.81 in |
| Brand | VekAuto (aftermarket) |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
They are shift solenoid circuit codes. On this transmission they usually trace back to the solenoid block or the valve body bores underneath it rather than a single bad solenoid, which is why replacing just the solenoids often does not fix the complaint for long.
Not reliably. Chrysler changed the 42RLE valve body and solenoid pack more than once across the production run. Match the number stamped on your old body - 5078327AA or RL078327AA - against this listing before ordering.
ATF+4 only.
It is a professional-level job. The valve body goes in with the transmission in the vehicle, and the 42RLE is pressure-sensitive - a body that is not torqued flat in the correct pattern will cross-leak between circuits and create new shift complaints.
If the unit has significant miles, inspect the clutch drum. Drum and clutch wear on a high-mile 42RLE can mimic the same slip and harsh-shift symptoms as a failing valve body.
