Product Description
FLEECE FPE-CLNTBYPS-CUMMINS-0607-SS CUMMINS COOLANT BYPASS KIT 06-07 AUTO TRANS WITH STAINLESS STEEL BRAIDED LINE
The FLEECE FPE-CLNTBYPS-CUMMINS-0607-SS Coolant Bypass Kit is engineered specifically for 2006–2007 5.9L Cummins trucks equipped with an automatic transmission. This kit solves one of the most common cooling issues on modified Cummins trucks—excessive coolant pressure at the rear of the cylinder head. By redirecting coolant from the back of the engine, this bypass kit balances coolant flow and helps prevent blown freeze plugs, elevated coolant pressure, and head gasket stress.
Featuring a high-quality stainless steel braided coolant line, precision-machined fittings, and Fleece’s proven thermostat housing integration, this system is built for long-term reliability in towing, daily driving, and high-performance Cummins applications.
Key Features
- Reduces rear-cylinder coolant pressure on 5.9L Cummins engines
- Helps prevent blown freeze plugs and head gasket failures
- Includes stainless steel braided return line for enhanced strength and durability
- Thermostatic coolant control ensures optimal operating temperatures
- Ideal for tuned, towing, or high-performance Cummins trucks
- Direct-fit kit for 2006–2007 5.9L Cummins with automatic transmission
Vehicle Fitment
- 2006–2007 Dodge / Ram 2500 5.9L Cummins (Automatic Transmission)
- 2006–2007 Dodge / Ram 3500 5.9L Cummins (Automatic Transmission)
- For automatic transmission models ONLY (not compatible with manual transmission trucks)
Cross-Reference & Related Fleece Products
Pair this upgrade with other cooling and fuel system enhancements from Fleece Performance:
- 06-07 Cummins Coolant Bypass – Standard Line:
FLEECE FPE-CLNTBYPS-CUMMINS-0607 CUMMINS COOLANT BYPASS KIT 06-07 AUTO TRANS - 03-07 Cummins Coolant Bypass (Manual Trans):
FLEECE FPE-CLNTBYPS-CUMMINS-0307-MANUAL COOLANT BYPASS KIT FOR 03-07 MANUAL TRANS - 2010–2018 High Flow Feed Line Kit:
FLEECE FPE-HFFL-1018 HIGH FLOW FEED LINE KIT - CP3 Feed Fitting:
FLEECE FPE-CP3-FEED 1/2 INCH CP3 FEED FITTING
FAQ
Why do 5.9L Cummins engines need a coolant bypass kit?
The rear cylinders of the 5.9L Cummins tend to experience high coolant pressure, especially on tuned or heavily loaded trucks. A coolant bypass kit releases excess pressure and increases coolant flow from the rear of the engine, helping prevent blown freeze plugs and head gasket issues.
Will this kit fit manual transmission trucks?
No. This kit is specifically designed for automatic transmission 2006–2007 5.9L Cummins trucks. For manual models, use the Fleece FPE-CLNTBYPS-CUMMINS-0307-MANUAL kit.
Does the stainless braided line offer an advantage over rubber?
Yes. The stainless steel braided line improves durability, heat resistance, abrasion resistance, and long-term reliability—especially in high-temperature or high-vibration applications.
Does this kit affect coolant warm-up time?
No. The kit includes a thermostat-controlled design that maintains proper warm-up behavior and prevents premature coolant circulation.
Will this help prevent head gasket failure?
While no single part can completely prevent failures, a coolant bypass kit significantly reduces rear-cylinder coolant pressure—a major contributor to blown head gaskets on tuned and hard-working Cummins trucks.
Specifications for FLEECE FPE-CLNTBYPS-CUMMINS-0607-SS
| Attribute | Value |
|---|---|
| Brand | Fleece Performance Engineering |
| Part Number | FPE-CLNTBYPS-CUMMINS-0607-SS |
| UPC | 670875705302 |
| GTIN | 670875705302 |
| Engine Compatibility | 2006–2007 5.9L Cummins (Automatic Transmission Only) |
| Line Material | Stainless Steel Braided Coolant Line |
| Configuration | Rear Cylinder Head Coolant Pressure Bypass System |
| Cross Reference | FPE-CLNTBYPS-CUMMINS-0607, FPE-CLNTBYPS-CUMMINS-0307-MANUAL, FPE-HFFL-1018, FPE-CP3-FEED |
| E-Codes | Not specified |
| Country of Origin | USA (as listed by distributors) |
| Shipping Weight | Approx. 3 lbs |
| Package Dimensions | Approx. 12" x 9" x 4" |
| Shipping Method | Standard Ground (Small Parcel) |
| Prop 65 Warning | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
