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 |
Order Processing Time:
Orders are typically processed within 24-48 hours after the order has been placed.
Custom or special order items may take longer to process, typically 3-5 business days depending on the product and customization required.
Shipping Methods:
Standard Shipping (3-7 business days - location dependent)
Express Shipping (1-2 business days- location dependent)
Packaging:
All parts are securely packaged to better prevent any damage during transit. Fragile or high-value parts will be packaged with additional protective materials, such as bubble wrap or foam padding.
Shipping Rates:
Shipping rates vary based on the size, weight, and destination of the package. You can view the estimated shipping costs for your order during the checkout process before placing your order.
Order Tracking:
Once your order has been shipped, you will receive an email with the tracking number and carrier information. You can also track your order status by logging into your OCDiesel account.
USA Shipping:
We ship to the USA! (Except California) Please note that USA shipping rates and delivery times may vary based on destination. Customers are responsible for any customs fees, import taxes, or additional charges that may apply.
Not all products are stocked in-house. To ensure you receive your desired items promptly, please check for availability before placing your order. Some products may be backordered due to high demand or supply chain constraints, which could result in longer delivery times.
We strive to keep our inventory updated regularly, but availability can change quickly. For the most accurate information, contact the OCDiesel customer service team using either this link, or the chat bubble on the bottom right of this page.
Most items are eligible for return within 30 days of shipping, provided they are unused, in original manufacturer packaging, and in resalable condition. All returns & cancellations are subject to restocking and cancellation fees.
Returns must include a Return Authorization Number (RA #) and be shipped with tracking. Return shipping costs are the responsibility of the customer.
Custom/special orders, electronics, and digital goods are final sale—no returns, refunds, or exchanges.
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