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.
How to Identify If Your Truck Has This System
This upgrade is specifically designed for trucks equipped with advanced cooling options. You can confirm your truck needs this by checking these two locations:
Driver’s Side Wheel Well: Look near the fuel filter by the engine block. If you see a square aluminum block where the transmission lines meet, you have the serviceable bypass block that this ATS unit replaces.
In Front of the Radiator: If you have a secondary "mini" radiator mounted in front of the main cooling stack, your truck utilizes the thermal bypass system associated with the NHT or AHQ options.
Performance & Engineering Benefits
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.
Vehicle Compatibility & Quick Specs
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
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
The ATS Diesel Advantage
"Heat is the enemy of any heavy-duty transmission. The factory bypass block in 2010-2012 trucks with the AHQ or NHT options is a known bottleneck. Our billet replacement block ensures that your cooling system is always active, providing long-term reliability for your 68RFE or Aisin transmission."
ATS LIMITED PRODUCT WARRANTY
ATS Transmission packages carry a standard THREE YEAR Warranty. There are several exceptions, so refer to the Warranty’s specific terms and conditions . All labor, shipping, or any other charges associated with the product and the product’s failure are not covered under Warranty. Labor and/or shipping charges will not be refunded under any circumstance. After the one-year anniversary date of the original purchase, there is a limited parts replacement Warranty only. Transmissions that are purchased separately outside of a transmission package / stage and are installed without an ATS torque converter carry a 1 year parts only warranty and there is no labor or shipping allowance for transmission only purchases.
In the event of a product failure, the consumer must return the defective product to ATS for inspection before a replacement is sent to the consumer. After ATS inspects the product and completes the failure analysis, the inspection officer at ATS will provide written documentation stating the condition of the product and determine, to the best of his or her ability, what caused the malfunction or complaint. Based on the findings of the inspection report, ATS will determine whether there is a valid Warranty claim. Should a consumer require immediate service, and chooses not to wait for their product to be returned to ATS for inspection, service, and potential repair or replacement, the consumer can purchase a replacement product from ATS. The consumer must pay the full current MSRP, the applicable core charge, and shipping to and from ATS’ shop. When the defective product arrives, ATS will refund the core charge and inspect the product. During inspection, ATS will assess the product for warrantable damage. If the original product has indeed failed under the terms of the original Warranty, ATS will refund the full purchase price for the replacement product only. If the product has failed due to any issue not covered under the original Warranty, ATS will assess charges to the consumer based on any parts necessary to return the product to nominal ATS standards. ATS will deduct the total cost of required parts from the replacement product’s purchase price, and the consumer will be refunded the difference (if any) between the purchase price paid for the replacement product and the cost of parts.
If the consumer can wait for their product to be returned to ATS for inspection, service, and potential repair or replacement, the consumer pays shipping to and from ATS’ shop. When the defective product arrives in Colorado, ATS will inspect the product. ATS will then assess the product for warrantable damage. If the product has failed under the terms of the original Warranty contract, ATS will repair or replace the product – at ATS’s discretion. If the product has failed due to any issue not covered under the original Warranty, ATS will assess charges to the consumer based on any parts necessary to return the product to nominal ATS standards. ATS will bill the consumer for the total cost of parts required for repair of the product, and shipping to and from Colorado, prior to the repaired/replaced product being sent to the consumer.
ATS Manual Transmissions Warranty
This section incorporates Section 2, entitled “In the Event of a Failure.” ATS manual transmissions carry a 1-year/12,000 mile Warranty. ATS will not pay for any fluids replaced in the event of a transmission failure. There is no labor or freight warranty coverage on standard transmissions. Manual transmission shafts and gears are not covered by this Warranty on any transmission due to the capability of certain situations to cause stress-loads beyond the structural ability of the shaft or gear.
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