66RFE Pump 2012-2018, remanufactured and ready to install. Fits the 66RFE. Ships fast from the USA.
A gas-powered Ram 2500, Power Wagon or 3500 Chassis Cab that hesitates before it drops into Drive, slips when it is loaded down, and whines in step with the engine is often telling you the 66RFE front pump is worn out. This is a remanufactured Mopar-brand pump assembly for the 2012-2018 66RFE, the six-speed behind the 5.7L Hemi and, from 2014, the 6.4L Hemi. It is the complete pump with its stator support, so you replace the whole hydraulic heart of the transmission in one piece.
The 66RFE is a hybrid: Chrysler put the heavy-duty 68RFE gearset inside the lighter 545RFE case for its gas heavy-duty trucks. The pump sits right behind the torque converter and turns whenever the engine runs, driven by the converter hub. On the RFE family it is much more than a fluid mover. The pump body and cover carry the pressure regulator valve that sets main line pressure, the TCC regulator and TCC switch valves that control converter clutch apply and release, and the TC limit valve that meters oil to the converter and cooler. The transmission computer commands line pressure through a solenoid in the solenoid pack and reads actual pressure back from a sensor, so when the pump can no longer keep up, the computer usually notices before the clutches burn.
Start with the free checks. Set the fluid level hot, in Park, on level ground, because a low or overfilled 66RFE foams and builds pressure slowly, which feels exactly like a bad pump. Then use a scan tool to compare desired and actual line pressure with the fluid warm. If actual pressure trails desired while the pressure solenoid is already commanding maximum, the supply side is short. Also note whether the delay happens only on the first shift after the truck sits overnight; that pattern usually points to converter drainback or air in the underdrive clutch, not a worn pump. Our 66RFE delayed engagement guide covers that order of checks, and the RFE pump failure guide explains the pressure readings that separate a pump from a valve body problem.
This pump is listed for the 66RFE from 2012 through 2018. In that window the 66RFE was installed in gas Ram 2500 and 3500 pickups, the Power Wagon and the 3500 Chassis Cab, first with the 5.7L Hemi and from the 2014 model year also with the 6.4L Hemi. It is not the transmission in a Cummins diesel Ram, which uses the 68RFE or an Aisin, and it is not in a Ram 1500. The build sheet sales code DFP identifies a 66RFE; DF3 is the Aisin. Pump assemblies changed during the RFE production run, so compare the bolt pattern, stator support and cover on your old pump with the photo, or send us your year and VIN before you order. The 66RFE identification guide walks through the tag and sales code, and every part we stock for this unit is on the 66RFE parts page.
When a pump fails on a truck that tows, the solenoid pack has usually seen the same heat and contamination. Pairing the pump with a 66RFE solenoid kit is common, and if the pan held clutch material, the 66RFE input drum for 2010-2018 is worth inspecting while the unit is apart.
| Fits | 66RFE 2012-2018 |
| Part type | Pump |
| Condition | Remanufactured |
| Brand | Mopar |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 2012-2018 66RFE transmissions, and the 6.4L Hemi trucks from 2014 through 2018 used the 66RFE (sales code DFP). Confirm your truck does not have the Aisin six-speed, compare your old pump with the photo, or send us your year and VIN and we will check it before it ships.
No. Diesel Rams use the 68RFE or an Aisin six-speed. The 66RFE was only used behind the gas 5.7L and 6.4L Hemi engines in 2500, 3500 and Chassis Cab trucks.
Read desired and actual line pressure with a scan tool once the fluid is hot. If actual pressure falls short while the pressure solenoid is already commanding maximum, the supply side is weak. Check fluid level, the filter and its seal first, because a starved pump inlet causes the same readings.
ATF+4 only. Chrysler warns against substitute fluids, additives and sealers. Prime the pump before first start, then set the final level in Park with the fluid at full operating temperature.
Yes. Clear the transmission adaptives and run the quick learn or drive cycle relearn with a capable scan tool, so the computer stops applying corrections it learned for the worn pump.
