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The Correct 66RFE For Your Ram
This remanufactured 66RFE is built for the 2014 Dodge Ram 3500 Chassis Cab with the 5.7L HEMI V8 in a 4X2, rear wheel drive layout. The 66RFE is the factory specified 6-speed automatic for this exact engine and drivetrain, and it is the only automatic code that fits the gas 5.7L Chassis Cab. Because this unit is 4X2, there is no transfer case involved in the fitment.
The 5.7L HEMI paired with the 66RFE delivers 383 horsepower and 400 lb ft of torque on Ram 3500 Chassis Cab SRW models, making this transmission the standard powertrain partner for heavy duty single rear wheel configurations. Chrysler introduced the 66RFE in 2012 for gas powered Ram HD trucks, and it served Ram 2500 and 3500 Chassis Cab models through 2018, so this reman unit suits that full application window for the matching specs.
What Makes The 66RFE Heavy Duty
The 66RFE is a hybrid design that borrows components from both the 545RFE and the heavier duty 68RFE. It uses the aluminum case family of the 545RFE while pulling in reinforced geartrain parts derived from the 68RFE. That blend is what makes it capable of towing, hauling heavy payloads, and standing up to the torque demands of a working Chassis Cab.
Internally the 66RFE runs three planetary gear sets, three driving clutches, three holding clutches, and an overrunning clutch, all under full electronic control with an electronically controlled converter clutch. Unlike the 65RFE, all six forward gears are active in normal driving. The super low 6th gear functions as an extra overdrive to pull engine speeds down on the highway while towing.
The 2012-onward RFE transmissions use a single piece case and a two stage pump that shuts the secondary side at higher speeds for efficiency. The 66RFE is rated to handle up to 550 lb ft of torque, which is why it is trusted for commercial and fleet duty. Tow/Haul Mode and Electronic Range Select came standard on the Chassis Cab automatics.
Confirm Fitment Before You Order
Start with the drivetrain. This is a 4X2, rear wheel drive 66RFE, so it does not include or require a transfer case. If your truck is a 4X4, this is not the correct unit. Matching the 4X2 configuration to your vehicle is the first checkpoint before anything else on the order.
Next, confirm your axle gear ratio and output shaft spline count. The 66RFE and 68RFE share one set of splines on the overdrive shaft, while the 545RFE and 65RFE use two, which is an important service distinction. Checking these dimensions up front prevents an install surprise and keeps your downtime short.
Finally, verify the engine and year against the listing. This unit fits the 2014 Ram 3500 Chassis Cab with the 5.7L gas HEMI, naturally aspirated with no turbo. Give us your VIN and we will confirm the transmission code, drivetrain, and application against our records before the unit ships.
Every reman 66RFE we sell is inspected and verified against the exact application it is listed for. We confirm the transmission code, the 6-speed automatic architecture, the 4X2 output configuration, and the overdrive shaft spline count so the unit you receive matches a 2014 Ram 3500 Chassis Cab 5.7L. Because downtime on a Chassis Cab hurts, especially when it carries a flatbed, service body, or dump bed for commercial and fleet work, we move quickly to get the correct unit confirmed and on its way to your shop or driveway.
This 66RFE ships with a torque converter and bell housing as standard inclusions, so your installer has the core assembly needed for the swap. We recommend discussing the install plan with your technician ahead of time, because a transmission oil cooler replacement is required when installing a replacement 66RFE. Addressing the cooler during the install protects the fresh unit from contamination and helps it reach a long service life. Houston Engines backs the sale with knowledgeable support on fitment and specs throughout the process.
