ATS Thermal Bypass Valve Up-Grade for 2013-2018 OR 2019-2024 6.7L Cummins & 6.4L Hemi (CHOOSE CORRECT YEAR)
ATS Billet Thermal Bypass Valve Upgrade & Filter Coupler Fits 2013–2024 RAM 2500/3500/4500/5500 6.7L Cummins / 6.4L Hemi (68RFE / 66RFE & Aisin AS69RC) Protect your transmission from catastrophic overheating...
ATS Billet Thermal Bypass Valve Upgrade & Filter Coupler
Fits 2013–2024 RAM 2500/3500/4500/5500 6.7L Cummins / 6.4L Hemi (68RFE / 66RFE & Aisin AS69RC)
Protect your transmission from catastrophic overheating with the ATS Billet Thermal Bypass Valve Upgrade. Engineered specifically for 2013–2024 RAM 6.7L Cummins and 6.4L Hemi trucks, this upgrade replaces the failure-prone factory bypass valve assembly, ensuring continuous, unrestricted fluid flow through your transmission cooling stack at all times.
From the factory, Dodge incorporated a thermal bypass valve into the cooling lines of the 68RFE, 66RFE, and Aisin AS69RC transmissions. Intended to warm up transmission fluid quickly in cold climates, the OEM valve routinely sticks, leaks, or fails in the bypass position. When this happens, transmission fluid bypasses the cooler entirely—recirculating superheated fluid directly back into the transmission. Over time, this extreme heat causes severe clutch slippage, burnt fluid, and premature transmission failure.
The ATS billet cooler block completely eliminates the failure-prone internal thermostatic valve, forcing 100% of your transmission fluid through the cooler circuit. The result is a dramatic drop in operating temperatures and long-term peace of mind, whether you're daily driving or pulling heavy loads.
Key Features & Performance Benefits
Full-Time Fluid Cooling: Eliminates the restrictive internal bypass valve to ensure 100% of transmission fluid is routed through the cooler.
Prevents Thermal Damage: Significantly lowers fluid operating temperatures under heavy towing, high ambient heat, and steep grade conditions.
Premium Billet Construction: Precision CNC-machined from high-strength billet aluminum for maximum durability, corrosion resistance, and a leak-free seal.
Solves Factory Design Flaws: Stops the common issue of the OEM thermostat sticking closed and starving your transmission of proper cooling.
Complete Upgrade Kit: Includes the ATS Thermal Bypass Block, robust Clamp Plate, Billet Filter Coupler, and required sealing hardware for a seamless installation.
Replacement Hardware Available: Need extra or replacement seals down the road? Keep your setup leak-free with the ATS Thermal Bypass Valve O-Ring Kit (Includes 4 O-Rings).
Vehicle & Transmission Compatibility
Make & Model: RAM / Dodge 2500, 3500, 4500, 5500
Model Years: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Engine: 6.7L Cummins Turbo Diesel and 6.4L Hemi
Transmissions Supported: 6-Speed Automatic 68RFE / 66RFE & Aisin AS69RC
What's Included in the Box
(1x) ATS Billet Thermal Bypass Block
(1x) Heavy-Duty Cooler Block Clamp Plate
(1x) High-Flow Billet Filter Coupler
Installation O-Rings & Hardware
Expected Temperature Drops (Post-Upgrade)
By forcing 100% of transmission fluid through the factory cooling stack without restriction, expect substantial operating temperature reductions across all driving conditions:
Driving Condition Factory Bypass Temp ATS Upgraded Temp Expected Temperature Drop
Empty / Highway Cruising 190°F – 205°F 135°F – 155°F 35°F – 50°F Lower
Moderate Towing 205°F – 220°F 165°F – 185°F 30°F – 40°F Lower
Heavy Hauling / Mountain Grades 225°F+ 185°F – 200°F 25°F – 35°F Lower
The ATS Diesel Advantage: "Heat is the single leading cause of automatic transmission failure in heavy-duty Cummins trucks. The OEM bypass valve on 2013–2024 RAM models is notorious for sticking closed, preventing fluid from ever reaching the cooler. Installing the ATS Billet Thermal Bypass Block ensures your cooling system is working 100% of the time to extend the life of your 68RFE or AS69RC transmission."
ATS Thermal Bypass Valve Mounting Bracket
Fits 2019–2024 RAM 6.7L Cummins
If your truck is making a rattle sound or if you just looked under your truck and noticed a broken piece of metal near the thermal bypass valve, you’re most likely looking at a broken bracket that holds the thermal bypass valve securely in place. The factory brackets are thin, cheap, and subject to wearing prematurely due to the materials and finish used from the factory. If the bracket is broken on your truck, the lines vibrate with the engine, creating a weak connection at the lines and junctions that will eventually begin leaking.
When this bracket breaks, the only OEM solution is to purchase an entire transmission line assembly for a few hundred dollars. Replacing that full line is a messy, time-consuming repair that leaves automatic transmission fluid (ATF) spilled on your garage floor while you try to calculate and refill the exact amount lost.
ATS has solved that hassle with the ATS Thermal Bypass Valve Mounting Bracket. Our heavy-duty bracket is made of thick 12-gauge steel and is completely corrosion resistant thanks to a high-quality zinc plating. This bracket is built to stay strong and sturdy for as long as you own the truck, holding everything firmly in place and keeping your transmission cooling system working efficiently.
It’s the perfect fix for true peace of mind—knowing your truck won't start rattling down the road on your next long trip or while driving down a remote washboard road. The installation is simple, and the fit and finish is just what your truck deserves to keep serving your every demand.
Key Features & Benefits
Heavy-Duty Upgrade: Built from thick, durable 12-gauge steel that outlasts fragile factory brackets.
Corrosion Resistant: Finished with a quality zinc plating to prevent rust and degradation from harsh road conditions.
Saves Time & Money: Solves the problem directly without needing to buy a costly, full OEM transmission line assembly.
No Messy ATF Spills: Avoids the hassle of disconnecting full transmission lines and spilling fluid on your floor.
Prevents Leaks & Rattles: Locks the thermal bypass valve securely to eliminate line vibration and prevent future fluid leaks.
Simple Bolt-On Installation: Direct-fit upgrade designed for a quick and straightforward installation.