Not sure it fits your truck?
Our Wildwood, FL techs will confirm the right part for your build before you buy.
Call or Text (352) 722-5295Transmission lines on the 2004.5-2007 Ram 5.9L Cummins
Every automatic 5.9L truck in this range runs the 48RE, a four-speed that takes ATF+4. It holds 14.5-16.5 quarts dry, and a normal service refill is about 4 quarts. Burnt fluid is one of the signs of a 48RE in trouble, along with slipping and loss of lock-up, and Diesel Power Products reports failures in the 100,000-150,000 mile range even at factory power. Any time you have lines or fittings apart, check the fluid's condition and top it off with ATF+4.
What we carry
The Fleece Performance Engineering FPE-CLNTBYPS-CUMMINS-0607-SS Coolant Bypass Kit for automatic-transmission trucks, supplied with a stainless steel braided line. It is listed for 2006-2007 5.9L Cummins. Read the product page for exactly what comes in the box and how it routes before you start the job.
How to choose
Three questions settle fitment. Is the truck an automatic? This kit is listed for auto trans trucks. What year is it? The listing covers 2006-2007, so a 2004.5 or 2005 truck falls outside it even with the same engine. Which engine? The 2007 model year includes both the 5.9L and the 6.7L, and the 6.7L trucks got the 68RFE, so go by the engine and not the year.
Fitment notes
2006 was a change year on these trucks, with a body refresh, a new interior, the Mega Cab and a CAN-bus ECM. That is a good reason to trust the year range on a listing like this one. Verify by VIN, or call with your VIN and we will confirm. The Cummins hub has the rest of the platform.
Frequently asked questions
Will the Fleece coolant bypass kit fit my 2005 Ram 2500?
It is not listed for 2005. Fleece lists it for 2006-2007 5.9L Cummins trucks with an automatic transmission. Call the shop with your VIN and we will check what fits.
What fluid does the 48RE take, and how often should I change it?
ATF+4. Shop practice is fluid, filter and band adjustment every 30,000 miles, which is far more conservative than the 100,000-mile figure in the owner's manual schedule. On an unbuilt 48RE, that service is the cheapest insurance you can buy.
Is this kit for manual-transmission trucks?
The listing is for automatic-transmission trucks. Manual 5.9L trucks in this range run the NV5600 through 2005 or the G56 from mid-2005, and a 2005 can have either one.
Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.