Chrysler's 4-speed overdrive transmissions were introduced in the 1980s and evolved through multiple generations. The newer 45RFE/545RFE and 65RFE families are the most commonly encountered in Gen 3 Hemi applications.
46RE / 47RE / 48RE (BASED ON 727 PLATFORM): Configuration: 4-speed overdrive automatic (hydraulic with some electronic controls) Platform: Based on the 727 Torqueflite with overdrive gear added Applications and torque ratings: • 46RE: Up to ~300 lb-ft — used in lighter Dodge trucks and Jeep applications • 47RE: Up to ~450 lb-ft — used in Ram 1500/2500 with gasoline engines and early diesel • 48RE: Up to ~600 lb-ft — heavy-duty diesel application (5.9L and 6.7L Cummins) Applications: 1993–2007 Ram trucks, Jeep Grand Cherokee
45RFE / 545RFE (ELECTRONIC, GEN 3 HEMI COMPATIBLE): Configuration: 5-speed (545RFE) or 4-speed (45RFE) electronic automatic Applications: 1999+ Jeep, 2003+ Dodge Ram with Hemi, Chrysler 300 and Dodge Charger/Challenger with 5.7L Hemi Note: The 545RFE adds a fifth gear (an overdrive) over the 45RFE. Both are electronically controlled and work with the Gen 3 Hemi bellhousing pattern.
65RFE (6-SPEED ELECTRONIC): Configuration: 6-speed electronic automatic Applications: 2012+ Ram 1500/2500 with 5.7L Hemi and 6.4L Hemi Note: Represents the most modern Chrysler overdrive transmission in the RFE family.
NAG1 / W5A580: Configuration: 5-speed automatic (Mercedes-Benz sourced) Applications: SRT Hemi applications — Chrysler 300C SRT8, Dodge Magnum SRT8, Challenger SRT8 Note: The NAG1 is a Mercedes-sourced unit used in high-performance Hemi applications. It requires its own specific bellhousing adapter.
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