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Cummins Coolant Bypass Kit Auto Trans 2006-2007 Dodge Ram 2500/3500 5.9 Cummins Fleece Performance
SKU: FPE-CLNTBYPS-CUMMINS-0607-FQWW
Protect your 5.9L or 6.7L Cummins with the Fleece Performance Coolant Bypass Kit—engineered for lower coolant temps, consistent cylinder cooling, and maximum diesel reliability.
Vehicle Specific
Check if this part fits your vehicle.
Unlock superior diesel reliability and cooling with the Fleece Performance Coolant Bypass Kit for 2003+ 5.9L and 6.7L Cummins engines. The rear cylinders in these engines are prone to overheating due to restricted coolant flow, leading to excessive pressure, blown freeze plugs, and even catastrophic engine failure—especially in high horsepower or towing applications.
The Fleece Coolant Bypass Kit solves this by adding a secondary thermostat that activates based on temperature, not just pressure. This ensures even cooling across all six cylinders, prevents damaging pressure spikes, and lowers coolant temps at the most vulnerable points in your engine. Perfect for diesel enthusiasts pushing for more power, towing heavy, or anyone wanting to extend the life of their Cummins.
Each kit includes premium braided hose, AN O-ring fittings for a leak-free install, and billet hose brackets (for 2003+ models). For ‘03–‘07 5.9L automatics, the kit also removes the factory transmission fluid heat exchanger—ideal for high horsepower or warm climate builds. Invest in proven diesel performance and reliability with Fleece.
Benefits:
- Lowers coolant temperature at the rear cylinders
- Ensures consistent temperatures across all cylinders
- Prevents damaging coolant pressure build up
- Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation.
- Kits for MY 2003+ include billet hose brackets.
- Engine Year2006-2007
- Vehicle TypeTruck/SUV
- Property 65 WarningCALIFORNIA WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov
- BrandFleece Performance
- Country of OriginUSA
- Sold AsKit
Shipping Times
Most customers will see their parts within 3-5 business days. We will primarily ship with Purolator ground & DHL Express to ensure the fastest shipping possible.
Please Note: These are only estimates and shipping time may vary depending on your location, out of country and rural locations expect longer wait times.
Where Do We Ship
We will ship our products within Canada and the United States.
Please Note: There are limitations what can be shipped to the United States.
Damaged Shipments
We provide the option to purchase insurance as we are not responsible for any damage while with a courier, we don’t often see issues, but it does happen. If you purchased insurance we will put in a claim, if no insurance was purchased there will be no refunds or exchanges.
Return Policy
It happens sometimes we would like to return it. Here are our return rules:
- Prior to any return you must contact us and get an approval for a RMA number.
- Product must be unopened and have no damage.
- You must pay for the shipping back, please insure so if anything happens you can make a claim, we are not responsible for damage during shipping and is the sole responsibility of the customer.
- Regular products are subject to a 5% Restocking fee.
- Items over 50 lbs. or special orders will be subject to a 20% Restocking fee.
- Electronics & Tuning is a final sale and cannot be returned.