Fits for Dodge Ram Diesel 68RFE 68 RFE, 2500 3500 Transmission Trans Cummins 6.7 Diesel 6.7L 2013-2018. For 2013-2018 Dodge Ram 6.7L Cummins Diesel. 【Material】68RFE Thermostatic Upgraded Bypass is Precision design, made of a top quality Billet 6061 Aluminum, it aids in passive cooling of the block and fluid.