Industrial 45RFE 545RFE 68RFE Shift Solenoid Block Pack

The Industrial 45RFE/545RFE/68RFE Grey Shift Solenoid Block Pack is an integrated automatic transmission solenoid assembly that sits in the valve body to control hydraulic pressure routing for gear shifting, line pressure regulation, and torque converter clutch engagement. This grey connector block is designed for Chrysler RFE‑series transmissions and is commonly installed in Dodge Ram 1500–3500, Jeep Grand Cherokee, Dodge Durango, and Chrysler Aspen vehicles equipped with 3.7L, 4.7L, 5.7L HEMI, or 6.7L diesel engines where hydraulic control of gear selection, pressure modulation, and torque converter lock-up is required. It operates at 12V DC with ECU‑controlled on/off and PWM operation, featuring integrated electromagnetic solenoids with an aluminum valve body interface for internal valve body mounting, and is used with ATF+4 fluid. Common replacements include Mopar OEM 45RFE/545RFE/68RFE solenoid pack (latest grey connector revision), Sonnax RFE transmission valve body upgrade kit, and Dorman transmission solenoid block kit for RFE‑series applications.