66RFE Shift Kit, new and ready to install. Fits the 66RFE. Ships fast from the USA.
Owners usually land here after a 66RFE starts dropping into a fixed gear, setting pressure switch codes, or shifting fine cold and badly hot. Although the listing is filed as a shift kit, the box holds a complete Mopar solenoid block service: the block itself (Mopar 68002342AF, earlier 68002342AD), a 4WD primary filter that is also listed for 2010-2018 two-wheel-drive units, the spin-on filter and a pan gasket. That is everything you need to replace the electrical heart of the transmission and service the fluid in one pan drop. For a true hydraulic shift kit, see our TransGo RFE shift kit.
Every gear in the six-speed RFE is a pair of applied clutches, and the block decides which pair. Each solenoid opens or vents one clutch circuit, and a pressure switch for that circuit tells the computer whether the clutch really filled. The 66RFE also depends on the multi-select solenoid and the solenoid switch valve to move oil between the low/reverse clutch and the converter clutch circuit. Because the computer checks each step, a coil that weakens or a switch that sticks shows up quickly as a code and a protective fixed gear rather than as a slow decline. That is why a solenoid block, not a spring kit, is the repair for those complaints.
Confirm line pressure is healthy before blaming the block, because a weak pump starves every circuit and sets similar codes; our RFE pump failure guide explains that check. If the transmission refuses fifth and sixth, read our guide to an RFE that will not shift into overdrive, which separates normal strategy from a real failure. A block fault usually repeats on the same circuit and comes back right after codes are cleared.
The kit is listed for 1999-2018 45RFE, 545RFE, 65RFE, 66RFE and 68RFE transmissions with the white 23-pin pass-through connector or the 2011-2018 gray connector. Pull the pan or look at the case connector before ordering. Transmission Digest describes three generations: white, gray (which dropped the overdrive solenoid) and the 2019-up blue design with a reverse clutch solenoid and separate converter clutch solenoid. A blue-connector 66RFE needs a different block and gasket, so this kit is not for it. If you are unsure, send us your year and VIN, or compare other parts on our RFE parts page.
If the valve body bores are worn, a new block will not stop the codes. A complete RFE valve body is the next step in that case, and a healthy cooler such as our RFE transmission cooler keeps temperatures down when you tow.
| Fits | 66RFE |
| Part type | Shift 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.
A Mopar solenoid block, a 4WD primary filter (also listed for 2010-2018 2WD units), a spin-on filter and a pan gasket. It is not a hydraulic shift kit.
Look at the pass-through connector on the case. White and gray connectors are covered by this kit. A blue connector means a 2019-up design that needs a different block and gasket.
Use a gasket that matches your connector generation and is in good condition. The early and late gaskets route oil differently, and the wrong one can cause a bind-up or a neutral 2-3 shift.
ATF+4 only. Check the level at operating temperature after the install.
It will if the block or one of its pressure switches is the cause. Check line pressure and the case connector first, because a weak pump or a wiring fault can set the same codes.
