48RE Transmission Cooler 2006, used and ready to install. Fits the 48RE. Ships fast from the USA.
Owners of a 2006 Ram 2500 with the 5.9L Cummins and the 48RE automatic usually land here for one reason: a factory steel cooler line has rusted, split, or been bent, and they want the original part back rather than a universal hose. This is a used factory transmission oil cooler tube, part number 52028922AL, pulled from a 2006 Ram 2500 5.9L diesel. It is a single formed steel line, the same shape and routing the truck left the factory with.
The 48RE pushes hot fluid from the converter circuit out of the case, forward to the heat exchanger in front of the radiator, and back into the transmission through a second line that feeds lubrication. The factory steel tubes follow a fixed path along the engine and frame and connect with quick-connect fittings. Because the shape is preformed, an OEM tube clips back into the original brackets and clears the exhaust and steering the same way the old one did, which is the main reason to choose it over a hose kit when only one line is damaged.
Find the leak with the engine warm and the truck on level ground, and follow both lines from the case to the cooler. If the line is dry and the truck still overheats, the problem is flow, not this tube. ATRA's GEARS Magazine recommends checking for roughly one gallon per minute of cooler flow at warm idle and points to a stuck bypass valve in the factory heat exchanger as a common cause of low flow on these trucks. The 48RE cooler line replacement guide covers the flow test and the full circuit, and our 48RE Cummins problems guide explains what heat does to the overdrive clutch and converter.
This tube came off a 2006 Ram 2500 with the 5.9L Cummins diesel and the 48RE, and it carries part number 52028922AL. The 48RE trucks use two different cooler lines (one out, one back), and the routing can change with drivetrain and cab configuration, so the part number is what matters. Check the number on your old line or with a parts counter against 52028922AL before ordering. If you cannot read it, send us your year and VIN and we will help match it. All parts for this transmission are listed on our 48RE parts page.
This is a used factory part from a donor truck. Expect normal surface wear for the age of the vehicle. Inspect the ends and quick-connect fittings when it arrives, and blow it out with low-pressure air before installation to make sure the line is clear.
If both lines are rusted, a braided cooler line kit for the 5.9 Cummins replaces the pair at once. If the heat exchanger is plugged, replace it with the 48RE oil cooler heat exchanger while the lines are apart.
| Fits | 48RE 2006 |
| 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.
One used factory steel transmission oil cooler tube, part number 52028922AL, from a 2006 Ram 2500 5.9L Cummins with the 48RE. It is a single line, not a pair and not the cooler itself.
It came from a 2006 Ram 2500 5.9L diesel. Match part number 52028922AL to the line you are replacing, since the supply and return lines differ and routing varies by drivetrain and cab. Send us your year and VIN if you are unsure.
A factory line is the right choice when one line is damaged and you want stock routing and fittings. If both lines are rusted or the truck lives in salt country, a braided kit replaces both at once and will not rust through.
Chrysler ATF+4 meeting MS-9602. Fill by the dipstick with the engine running and fluid hot, in Neutral, on level ground.
Usually not. Check cooler flow first. Low flow without a leak points to a crushed line, a stuck bypass valve in the heat exchanger, or worn pump and valve body circuits.
