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Cummins Coolant Bypass Kit Auto Trans with Stainless Steel Braided Line 2003-05 Dodge Ram 2500/3500 5.9 Cummins Fleece Performance
SKU: FPE-CLNTBYPS-CUMMINS-0305-SS-FQW
Upgrade your 2003–2005 Dodge/Ram 5.9L Cummins automatic with the Fleece Performance Coolant Bypass Kit—featuring stainless braided lines for lower temps, pressure control, and maximum diesel reliability.
Vehicle Specific
Check if this part fits your vehicle.
Protect your 2003–2005 Dodge/Ram 2500/3500 5.9L Cummins automatic from overheating and pressure-related failures with the Fleece Performance Coolant Bypass Kit. The rear cylinders on the 5.9L Cummins are notorious for poor coolant flow, leading to higher temps, excessive system pressure, and the risk of blown freeze plugs or catastrophic engine damage—especially in high horsepower or heavy towing applications.
This kit features a secondary thermostat that activates based on coolant temperature, not just pressure, ensuring even cooling across all six cylinders and preventing dangerous pressure spikes before they start. The complete kit includes premium stainless steel braided hose and AN O-ring fittings for a leak-free, high-performance installation, plus billet hose brackets for a secure fit.
The Fleece Performance Coolant Bypass Kit is a must-have upgrade for any diesel owner looking to protect their 5.9L Cummins, boost reliability, and keep their truck running strong under any load or conditions.
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 and up include billet hose brackets.
- Engine Year2003-2005
- 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.