66RFE Overhaul Kit 2019, new and ready to install. Fits the 66RFE. Ships fast from the USA.
If you searched for a 66RFE overhaul kit for a 2019 or newer truck because the transmission now hesitates on the upshifts, slips when you tow, or keeps setting pressure-related codes, read this first. This listing is a new billet valve body rebuild kit, manufacturer part number CR-2769-RKM, not a clutch-and-seal overhaul set. It rebuilds the hydraulic side of the 2019-and-later 5-ball RFE valve body, the design shared by the 66RFE, 65RFE and 68RFE, so the pressure the computer commands actually reaches each clutch.
Every shift in a 66RFE is electronic. The computer pulses solenoids, the valve body routes the resulting oil to a clutch piston, and pressure switches report back whether the circuit is holding. When the solenoid switch valve bore wears, or the plates between the valve body sections stop sealing, part of that oil leaks to exhaust. The clutch still applies, but with less clamping force, and the extra slip turns into heat and burnt friction material. Towing magnifies the problem because the computer asks for more line pressure and the leak grows with it. This kit attacks the leak paths directly: a billet channel plate, a blocked separator plate with fresh gaskets, billet accumulator pistons with new seals on a support plate, a drop-in switch valve with plugs, and heavy-duty bolts to clamp it all flat.
Confirm the fluid is ATF+4 and full when hot, and check that the truck has every available software update. A healthy RFE should show commanded and actual line pressure in close agreement at idle; GEARS Magazine gives 60 to 70 psi at a 22 to 24 percent duty cycle as the normal idle picture. For a P0871, Sonnax describes the overdrive pressure switch closing around 22 psi and reopening near 11 psi, and shows how to read the switch states gear by gear to separate a hydraulic leak from an electrical fault. Our valve body testing guide covers the full process, and the Ram 3500 shift problems guide lists the other faults that feel the same from the driver seat.
This kit is built for 2019-and-later 5-ball RFE valve bodies. In 2019 the valve body gained a lower section on the channel plate that houses a separate TCC solenoid and a Reverse accumulator, and the solenoid pack connector turned blue instead of gray. A 66RFE valve body without those features takes a different kit. Look at the unit before you buy, or send us your year and VIN and we will check it for you. More parts for this transmission family are on our RFE parts page.
Work on a clean surface and keep each valve and spring in order as the sections come apart. The switch valve and plugs drop into the existing bore, so no reaming is required. Lubricate the new piston seals with ATF+4, install the blocked separator plate and gaskets with the billet channel plate as a set, and torque the new bolts in steps to the factory specification so the plates seal evenly. Because a leaking valve body often leaves debris behind, change the filters with a kit like the 68RFE filter and pan gasket kit, and a deep aluminum pan adds fluid capacity for towing. Fill with ATF+4, set the level hot, clear codes, and perform the quick learn before the first loaded drive.
| Fits | 66RFE 2019 |
| 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. It is a valve body rebuild kit, part number CR-2769-RKM, with billet plates, accumulator pistons, a switch valve, plugs, gaskets and bolts. Clutch packs and case seals are sold separately.
No. It fits only the 2019-and-later 5-ball valve body that has the lower section on the channel plate and the blue solenoid pack connector.
It can when the code comes from a hydraulic leak in the valve body. Test the overdrive pressure switch and wiring first, then confirm the leak with pressure and switch-state checks before buying.
No reaming tools are needed because the switch valve is a drop-in design. You need a torque wrench, a clean bench, and a scan tool for the quick learn after installation.
ATF+4 only. Check the level with the fluid at full operating temperature and change the filters at the same time.
