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13-18 Ram 6.7L Cummins DFuser Thermal Bypass Valve Upgrade

This is a MUST for any truck that has a 68-RFE or Aisin AS69RC transmission or the Dodge HEMI with 545RFE, 65RFE, or 66RFE Transmissions in it. Dodge decides to incorporate a transmission cooler by pass valve into the cooling system of the 68-RFE and Aisin AS69RC that bypasses the transmission cooler during cold operation. The intent is to force the transmission to warm up faster, the reality is this bypass valve leaks and sticks in the bypass position in almost every case causing the transmission cooler flow to bypass the trans cooler essentially eliminating the trans cooler from the circuit. This causes a severe damage to the transmission over time. The dfuser cooler block replaces the faulty design eliminating the bypass valve and ensures 100% of the trans cooler flow is forced through the trans cooler. 


  • Direct replacement
  • Reduced transmission temperatures.
  • 1/8 Inch NPT Test Port
  • Replaces PN 68186711AA, 68186711AB

DFuser Part Number: DFR-1002399

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