66RFE Overhaul Kit 2007, new and ready to install. Fits the 66RFE. Ships fast from the USA.
Gas heavy-duty Rams get worked as hard as the diesels: plow trucks, Power Wagons on the trail, 3500 chassis cabs hauling a service body every day. When the six-speed behind the Hemi in one of those trucks starts slipping on a pull, leaking at the pan or hesitating into Drive, it is a 66RFE, and this boxed gasket and seal set is what it needs on the bench. The photo shows valve body separator gaskets, the pan gasket, front seal, piston lip seals, sealing rings and O-rings. Frictions and steels are not included.
The 66RFE did not exist in 2007. Chrysler introduced it for the 2012 model year, and gas Ram 2500 and 3500 trucks before that used the 545RFE five-speed. The 2007 date comes from how this kit is catalogued across the RFE six-speed family, which began with the 68RFE diesel unit in 2007. In practice this kit applies to a 66RFE from 2012 on: the Ram 2500 and Power Wagon with the 5.7L, the 3500 chassis cab with the 5.7L, and the Ram 2500 with the 6.4L from 2014. If your gas truck is a 2007 through 2011, it has a 545RFE and needs a different kit.
The 66RFE is a hybrid. It carries 68RFE internals, including the gearset, inside a 545RFE-style case, which is why its six ratios match the diesel unit, from a 3.23 first gear to a 0.62 sixth. Like all RFE units it has no bands; each ratio is a clutch pack applied by a hydraulic piston. Oil leaves the pump, is steered by the solenoid pack and valve body, crosses spinning drums through sealing rings and is held behind each piston by lip seals. Hardened seals let that apply pressure leak away, the clutch takes longer to fill, and the controller sees slip it cannot correct.
Trace any leak to its source first, because one external seal does not justify a teardown. For slip, read codes and check line pressure against commanded. Sonnax lists the solenoid switch valve bore plug and the stator overdrive dribbler valve as wear points across the 45RFE through 68RFE family, and both can burn an overdrive clutch on a unit with good seals. Our RFE valve body testing guide explains how to check them, and the pump failure guide covers the low-pressure signs that mimic leaking seals.
Confirm your unit is a 66RFE by the transmission tag or VIN before ordering. A 2019 or later gas heavy-duty Ram has a newer design, and the 6.7L diesel trucks use the 68RFE, which has its own kit, the 68RFE overhaul kit for 2007. Lay the new gaskets over your originals before assembly, or send us your year and VIN and we will confirm the match. Related parts are on the 68RFE and 66RFE collection page, including the 66RFE overhaul kit for 2012-2018 trucks.
| Fits | 66RFE 2007 |
| 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. Gas Ram 2500 trucks before 2012 used the 545RFE five-speed. The 66RFE started with the 2012 model year, so check the transmission tag or send us your VIN.
They share internals and gear ratios, but the 66RFE sits in a 545RFE-style case behind the gas Hemi engines while the 68RFE is the 6.7L Cummins unit. Kits are not automatically interchangeable, so match your unit.
No. It is the gasket and seal set. Clutch plates are bought separately or as part of a master rebuild kit.
2012-2018 Ram 2500 and 3500 chassis cab with the 5.7L, the 2012-2018 Ram 2500 Power Wagon, and the 2014-2018 Ram 2500 with the 6.4L.
ATF+4 only. Set the level at operating temperature and recheck after the first drive.
