66RFE Overhaul Kit 2009-2016, new and ready to install. Fits the 66RFE. Ships fast from the USA.
This listing is titled as an overhaul kit, but what ships is a service and sensor kit for the RFE six-speed in 2009-2016 Ram 2500 and 3500 four-wheel-drive trucks: a 4WD sump filter, a spin-on filter, a pan gasket, an input speed sensor, an output speed sensor and a line pressure sensor. It is aftermarket, not factory-branded, and it contains no seals, frictions or steels. Buyers usually land here with a truck stuck in fourth gear and a speed sensor or pressure sensor code, or with a high-mileage 66RFE or 68RFE that is due for a pan drop and they want every external sensor renewed while the fluid is out.
The RFE controller decides every shift from three readings this kit replaces. The input sensor reads turbine speed and the output sensor reads tailshaft speed; dividing one by the other tells the computer which gear is actually engaged and how much the converter clutch is slipping. The line pressure sensor reports real hydraulic pressure so the controller can close the loop on the pressure it commands. If any of the three sends a bad signal, the controller cannot trust its own math, so it shifts erratically or shuts down to hydraulic limp mode. The sump filter cleans fluid on its way to the pump, and the spin-on filter cleans fluid returning from the cooler. Both trap the clutch debris that these transmissions shed when they are worked hard.
Read every code and graph input and output speed on a road test; the ratio should match the gear, and dropouts or spikes point at a sensor or its wiring. Swapping the two speed sensors is a cheap test, because a code that follows the sensor condemns it. If input and output codes set together, check the shared ground circuit before buying parts. Our 68RFE speed sensor guide covers the resistance check and the P0716 cases that are internal failures, not sensors. For pressure codes, put a mechanical gauge on the line tap. Sonnax describes P0933 as actual pressure more than 25 psi away from desired, so a gauge tells you whether the sensor or the hydraulics is wrong. The 68RFE pump failure guide explains the low-pressure side of that test.
The listing covers 2009-2016 Ram 2500 and 3500 four-wheel-drive pickups: the 68RFE behind the 6.7L Cummins, and the 66RFE behind the 5.7L and 6.4L Hemi. The listing quotes 2011-2016 for the gas trucks, but the 66RFE itself arrived for the 2012 model year, so 2012-2016 is the real 66RFE range. The filter is the four-wheel-drive version; two-wheel-drive trucks use a different sump filter. Compare the old filter, sensor connectors and pan gasket shape to the parts in the photo, or send us your year and VIN and we will check fitment. Everything else for these units is grouped in our 68RFE and 66RFE collection.
| Fits | 66RFE 2009-2016 |
| Part type | Overhaul Kit |
| Condition | New |
| 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. Despite the listing title, it is a service and sensor kit: a 4WD sump filter, a spin-on filter, a pan gasket, input and output speed sensors and a line pressure sensor. For a teardown you still need a gasket and seal overhaul kit, plus frictions if the clutches are worn.
Probably not. The 66RFE began with the 2012 model year, and a 2011 gas truck used an earlier RFE unit. The listing range for the gas trucks starts in 2011, so send us the year and VIN before ordering.
The sump filter in this kit is the 4WD version. A 2WD truck uses a different filter, so the sensors and gasket may be useful there but the filter will not match.
Only if a sensor is the cause. Fourth gear in Drive is the RFE limp mode and many faults can trigger it. Read the codes, check the shared sensor ground and graph input and output speed before replacing parts.
ATF+4 only. Check the level with the fluid at 160 degrees F or hotter, per the Chrysler procedure, or the reading will be wrong.
