Ram 2500 & 3500 6.4L Hemi 66RFE Transmissions & Transmission Parts

The big 6.4L Hemi V8 under the hood of your 2013-2018 Ram 2500 or 3500 is more than capable of putting out a ton of power and torque with relatively simple mods, but the factory 66RFE transmission certainly has trouble handling it all. Tier One manufactures an entire lineup of 2013-2018 Ram Hemi built transmission that can more than handle the huge power your Cummins Ram can get from aggressive tuning, turbo upgrades, injectors, and whatever else you throw on your tough Ram truck build. Our built 66RFE transmissions can hold huge levels of horsepower and torque, as well as heavy towing and aggressive off-roading so that that you can use your HD Hemi Ram the way it was meant. Also check out our Ram Transmission Rebuild Kits or our built 68RFE transmissions for the newer Ram trucks. Contact Tier One with questions or for custom builds!