66RFE Master Rebuild Kit 2012, new and ready to install. Fits the 66RFE. Ships fast from the USA.
The 66RFE is the transmission that most people do not realize they have. If you own a 2012 Ram 2500, a 3500 chassis cab or a Power Wagon with the 5.7L Hemi and the truck is slipping, flaring between gears or leaking from more than one seal, the box under it is a 66RFE, not the diesel 68RFE. This Mopar-boxed master rebuild kit is listed for the 2012 66RFE, the first model year the unit was built, and is aimed at the shop or owner who has decided the transmission is coming out and wants the soft parts from the factory parts channel rather than a mix of brands.
Chrysler created the 66RFE for 2012 by putting the 68RFE's internals and gearset inside a 545RFE-style case, so the gas heavy-duty Rams got six forward speeds without the larger diesel bellhousing. Like every RFE unit it has no bands; each gear is made by applying clutch packs with hydraulic pressure routed from the valve body through the solenoid switch valve. When frictions glaze or seals harden, apply pressure leaks off and the clutch slips. A master kit is the complete-overhaul package: it is meant to reseal the case and pistons and renew the clutch packs so the unit leaves the bench with fresh friction surfaces instead of one new pack next to five tired ones. The product photo shows the factory Mopar box with sealing rings and gaskets packed on top; if you need the full content list checked against your teardown before ordering, ask us and we will confirm it.
Overdrive clutch slip on the RFE family is not always a worn clutch. Sonnax's troubleshooting notes, which cover the 66RFE by name, point to wear at the solenoid switch valve bore plug and to the stator overdrive dribbler valve as common culprits, and a vacuum test of the switch valve is the quick check. Read the pan debris, scan for stored codes and test line pressure first. Our 68RFE rebuild guide walks through the same internals the 66RFE shares and explains what to measure, and the RFE pump failure guide covers the low-pressure symptoms that can mimic a clutch problem.
This kit is listed for the 2012 66RFE. That year covers the Ram 2500 and Power Wagon and the 3500 chassis cab with a gas V8; diesel trucks use the 68RFE and need a different kit. Chrysler made running changes to the RFE family over the years, so match the kit to your case and valve body before teardown, or send us the year and VIN and we will check it. Pumps, valve bodies and other parts for these trucks are grouped in our 68RFE and 66RFE collection.
| Fits | 66RFE 2012 |
| Part type | Master Rebuild Kit |
| Condition | New |
| 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.
If it has the 5.7L Hemi gas engine it uses the 66RFE. The 6.7L Cummins diesel uses the 68RFE. The 66RFE was introduced for the 2012 model year, so this kit matches the first year of production.
This kit is listed for 2012. Later trucks, including the 6.4L Hemi models, may use updated parts. Send us your year and VIN and we will check fitment before it ships.
Check the pump and the valve body. Worn pump gears and an eroded valve body separator surface are the two parts most likely to undo a fresh rebuild.
Mopar ATF+4 only. Set the level with the fluid hot and recheck it after the first few drive cycles.
Yes. Run a TCM quick learn with a capable scan tool once the truck is at operating temperature so the controller adapts to the new clutches.
