2010-2012 Cummins 6.7L ATS 68RFE/AS68RC Thermal Bypass Valve Upgrade (310-005-2356)
Protect your transmission from catastrophic heat failure with the ATS Thermal Bypass Block Upgrade (310-005-2356). For owners of 2010-2012 RAM 6.7L Cummins trucks equipped with the Max Tow Package (Sales Code AHQ) or the Dual Transmission Oil Cooler (Sales Code NHT), the factory thermal bypass block is a notorious failure point. This billet aluminum block is a complete, high-flow replacement for the OEM unit, ensuring 100% of your transmission fluid reaches the coolers at all times.
Whether you are running the 68RFE or the Aisin AS68RC, the factory block found in the 52014523AB assembly contains an internal thermostat that frequently sticks in the closed position. When this occurs, hot fluid is routed straight back into the transmission, skipping the cooling system entirely. The ATS upgrade solves this by providing a solid-flow billet block that eliminates the restrictive valve, keeping your fluid temps stable and your transmission clutches protected.
Temperature Expectations (Post-Upgrade)
By enabling full-time fluid flow through your cooling stack, the ATS block (310-005-2356) drastically lowers operating temperatures. Expected results:
| Driving Condition |
Factory Block Temp |
ATS Upgraded Block Temp |
Expected Drop |
| Empty (Highway) |
190°F – 200°F |
130°F – 150°F |
40°F – 60°F |
| Towing (Moderate) |
200°F – 215°F |
160°F – 180°F |
30°F – 40°F |
| Towing (Heavy / Grade) |
220°F+ |
180°F – 195°F |
25°F – 30°F |
- ATS Part Number: 310-005-2356
- Direct OEM Block Replacement: This unit is a complete billet replacement for the factory block found in OEM Assembly 52014523AB.
- Prevent Transmission Failure: By removing the failure-prone internal thermostat, you eliminate the risk of the valve sticking closed, which is the primary cause of rapid transmission overheating.
- Maximum Cooling Efficiency: Engineered to allow unrestricted fluid volume to and from the transmission oil cooler, keeping your 6.7L Cummins within safe operating temperatures during heavy hauls.
- Premium Billet Construction: CNC-machined for precision fitment and anodized for a professional look and superior corrosion resistance.
- Easy Installation: Features engraved flow marks for a clear-cut install and includes new replacement O-rings to ensure a guaranteed leak-free seal.
- Make: RAM / Dodge
- Years: 2010, 2011, 2012
- Engine: 6.7L Cummins Turbo Diesel
- Transmissions: 68RFE or Aisin AS68RC
- Relevant Sales Codes: AHQ (Max Tow Package) or NHT (Dual Transmission Cooler)
- Replaces OEM Part: Serviceable block in Assembly 52014523AB
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