45RFE Solenoid Kit 1999, remanufactured and ready to install. Fits the 45RFE. Ships fast from the USA.
Owners of the first 45RFE trucks and Jeeps are often searching for the same thing: why the transmission went into limp mode, why the check engine light shows a solenoid or pressure switch code, and whether the solenoid pack is the fix. This kit replaces the pack and services the filters in the same job. Going by the product photo it contains the solenoid pack, the sump filter, the round spin-on cooler return filter and a molded pan gasket, so you are not buying filters separately once the pan is already off.
Sonnax describes the 45RFE as the first rear-wheel-drive Chrysler automatic that was fully electronic when it arrived in 1999. Older Chrysler rear-drive units used a hydraulic governor and 1-2, 2-3 and 3-4 shift valves to decide when to shift. The 45RFE drops all of that. The computer fires solenoids in the pack to fill each clutch directly, and pressure switches inside the same assembly tell the computer the apply really happened. On this pack the solenoids are low/reverse, multi-select, underdrive, overdrive, 4th clutch and 2nd clutch, plus a pressure control solenoid that sets line pressure. Everything goes through one 23-pin connector on the case, which is why a single bad coil, cracked housing or failed switch can upset every gear.
A 1999 truck is old enough that the harness and connector deserve as much suspicion as the pack. Unplug the 23-pin connector and check for oil inside the plug, corrosion and loose terminals. GEARS Magazine's write-up on P0882 lists all of the solenoids as fed from pin 10, with roughly 1.8 ohms per shift solenoid, about 3.7 ohms for the pressure control solenoid, and around 300 ohms from pin 10 to each pressure switch sense pin. A reading far off those numbers, or a pack that pulls the supply voltage down, points to the pack. Chrysler's own P0750 procedure says that code is electrical only and that the valve body should not be replaced for it. For the full step-by-step see our 45RFE shift solenoid symptoms and testing guide, and if pressure switch codes come with a slipping feel, read the 45RFE pump failure guide before blaming the pack.
This listing is labeled for the 1999 45RFE. That first year matters, because Sonnax reports the 1999 pack used a black connector that was short-lived, had plenty of issues and is not recommended if you come across one. Chrysler moved to a white connector in 2000 and kept it through 2009. The pack in this kit's photo has the white-style connector and the six-solenoid layout with the overdrive solenoid still in place, so it is not the gray 2010-on pack. If your truck is a true 1999 build, look at the connector on the pack you are removing and send us your year and VIN so we can confirm the plug and harness match before it ships. Every 45RFE part we carry is on the 45RFE collection page.
With the pan off, the pack is held to the valve body by a row of bolts; replace the sump filter while you are in there and inspect the pan magnet for clutch material or metal. Lay the new gasket on a clean, dry pan rail, install the new spin-on filter, and refill with ATF+4. Do not use a universal fluid. After plugging the case connector back in, clear codes and run the Quick Learn with a scan tool. Chrysler requires it after a solenoid pack replacement, and it only runs with the brakes on, the engine over 500 rpm, the throttle closed and the fluid between 60 and 200 F. If the magnet is heavy with debris, a 1999-2006 45RFE pump or a full 45RFE master rebuild kit may be the real repair rather than a pack alone.
| Fits | 45RFE 1999 |
| Part type | Solenoid Kit |
| 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.
The pack pictured has the white-style connector Chrysler used from 2000 to 2009. Sonnax says the original 1999 black-connector pack was short-lived and not recommended. Send us your VIN and a photo of your connector before ordering so we can confirm the harness side matches.
From the photo: the solenoid pack, the sump filter, the spin-on cooler return filter and a pan gasket. Fluid is not included.
ATF+4. Chrysler warns that a non-specified fluid can cause poor shift quality and converter shudder, so avoid universal or multi-vehicle fluids.
Yes. Chrysler lists solenoid pack replacement as a job that needs the Quick Learn procedure, done with a scan tool with the brakes applied, the engine above 500 rpm, closed throttle and fluid between 60 and 200 F.
It can. GEARS Magazine documented a shorted pack pulling the solenoid supply voltage low enough to set P0882. Unplug the pack and recheck the supply; if the voltage recovers, the pack is the problem.
