45RFE Transmission Cooler 2007, used and ready to install. Fits the 45RFE. Ships fast from the USA.
This listing is the steel transmission cooler line pair, not the radiator-mounted cooler itself. It is a used factory set removed from a 2007 Dodge Ram 1500 4x4 with the 5.7L Hemi and the five-speed RFE automatic, sold as a matched supply and return pair with the original bends and end fittings. People searching for it usually have ATF dripping off the crossmember, a line rusted through near a clip, a crimp joint weeping, or a line that got flattened during an earlier transmission swap and now the truck runs hot.
On the 45RFE and 545RFE the cooler circuit is not an add-on loop. Fluid leaves the pump through the to-cooler circuit, exits the case fitting, runs through these lines to the cooler in the radiator tank and any auxiliary cooler, then comes back into the case and feeds lube to the geartrain. A pinched or collapsed line does not just cut cooling, it starves lube to the planetaries. A slow leak drops the level until the pump pulls air. That is why a cheap-looking line problem can end in a burned transmission if it is ignored.
Degrease the lines, the case fittings and the pan rail, add dye if you have it, then drive and look. A joint wet on top is the leak; a line only wet on the bottom is catching drips from above. Check the case fittings and any spin-on cooler return filter before blaming a line, and check the level hot, because an overfilled RFE foams and pushes fluid out the vent. Our 45RFE cooler line replacement guide walks through leak tracing and flow checks. If the truck already ran hot, read the 45RFE pump failure guide too, since low cooler flow can also start inside the pump.
These lines came off a 2007 Ram 1500 4x4 with the 5.7L engine. Line routing on these trucks changes with engine, two-wheel versus four-wheel drive, and cooler package, so a 4.7L truck, a 2WD truck or a different model year may not share the same bends. Lay your old lines next to the photo and compare the ends, the bend pattern and the fitting styles. Used factory parts can show surface rust and normal wear. When in doubt, send us your year and VIN and we will check it before you order. More parts for this transmission are on the 45RFE and 545RFE parts page.
Clean each joint before disconnecting so dirt does not fall into the open quick-connects, and use the proper release method rather than prying. Chrysler's 45RFE/545RFE torque table lists the cooler line fitting at the transmission at 155 in-lb, which is only about 13 ft-lb into an aluminum case, so use an inch-pound wrench. Push each quick-connect straight home with clean ATF+4 on the O-ring, pull back to prove it latched, and make sure the dust cap snaps on; if it will not, the fitting is not seated. Route the lines exactly like the originals and reuse every clip and isolator. After the job, top up with ATF+4 and check flow at the return before the truck goes back in service. This is also a good time to service the fluid with our Mopar RFE fluid and filter service kit, and if the pan is leaking too, an aluminum 545RFE pan with a drain plug makes future services cleaner.
| Fits | 45RFE 2007 |
| 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.
It is the steel cooler line pair that runs between the transmission case and the cooler. The cooler in the radiator tank is not included.
Not guaranteed. These came from a 4x4 truck with the 5.7L engine, and line routing can change with drivetrain and engine. Compare your old lines to the photo or send us your VIN.
Chrysler lists 155 in-lb, about 13 ft-lb, for the cooler line fitting at the transmission. The case is aluminum, so over-tightening can strip the threads.
Yes. Some fluid is lost when the lines come off. Refill with Mopar ATF+4 and check the level hot in Park with the engine running, per the dipstick marks.
Only if the lines were the restriction. Check flow at the return line after installation; weak flow at the case fitting points to the pump or pressure regulator inside the transmission.
