68RFE Transmission Cooler 2010-2012, used and ready to install. Fits the 68RFE. Ships fast from the USA.
If your 2010-2012 Ram 3500 dually with the 6.7L Cummins is dripping red fluid near the front of the frame, losing ATF between checks, or throwing a transmission temperature warning on a pull, a corroded or crushed cooler line is one of the first things to look at. Read this before you order: despite the short product name, this listing is not a cooler core. It is a used, factory Mopar set of 68RFE transmission oil cooler lines removed from a 2010-2012 Ram 3500 dually, the steel tubing with its rubber hose sections and fittings that carries fluid between the transmission and the cooler at the front of the truck.
The 68RFE is a six-speed automatic built to sit behind the torque of the Cummins, and nearly all of its heat comes from the converter and from clutches slipping as they apply under load. Fluid leaves the case through one line, travels forward to be cooled, and returns through the other line to feed lubrication to the geartrain. The lines are long on a dually chassis and run close to the frame, exhaust and road spray, which is why they rust at clamps and crimp joints. GEARS Magazine lists plugged or restricted cooler lines as the first of six causes of an overheating 68RFE and says flow should be at least a gallon per minute. The same article notes that 200 degrees F is the ideal maximum, and every 20 degrees above that cuts expected transmission life in half.
Wash the area and find the highest wet spot; a pan gasket, case connector seal or radiator-side fitting can drip onto a line and fool you. Inspect both lines end to end, and squeeze each rubber section for soft spots. If nothing leaks but the truck runs hot, do the flow test GEARS describes: disconnect the return line into a bucket or use a flow meter and confirm at least a gallon per minute at idle. Weak flow with good lines points to the cooler, the bypass or the pump instead. Our 68RFE Ram 3500 common problems guide walks through heat-related failures, and the 68RFE pump failure guide covers the line pressure checks to run if flow is low.
These lines came off a 2010-2012 Ram 3500 dually with the 6.7L Cummins and 68RFE. Line routing on heavy-duty Rams can change with cab, box length, single versus dual rear wheels and cooling package, so compare the photos with your own lines, especially the bend pattern and the fitting ends, before you order. If you are not sure, send us your year and VIN and we will check it. Gas-engine trucks and other transmissions use different lines. Browse everything for this transmission on our 68RFE parts page.
A transmission that was run low or hot often needs more than lines. If it already slips or flares, look at a 2010-2018 heavy-duty 68RFE valve body or a full overhaul before you tow again.
| Fits | 68RFE 2010-2012 |
| Part type | Transmission Cooler |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Cooler lines. This listing is the factory steel and rubber oil cooler line set that runs between the 68RFE and the cooler at the front of a 2010-2012 Ram 3500 dually 6.7L. It does not include a cooler core.
They were removed from a 3500 dually. Routing can differ by wheel configuration, cab, box and cooling package, so compare the bends and fitting ends in the photos with yours, or send your year and VIN and we will check fitment before you order.
ATF+4 only. Top up with the engine running and the fluid at 160 degrees F or more before setting the final level on the dipstick.
Look for leaks, kinks and rust first. If the lines are dry and straight but the truck still runs hot, measure flow at the return line. At least a gallon per minute is the target; low flow with good lines points to the cooler, the bypass valve or low pump output.
Yes, especially if the old fluid was dark or the transmission was rebuilt. Debris trapped in the cooler will travel back into the transmission through the new return line.
