48RE Pump 2003-2008, remanufactured and ready to install. Fits the 48RE. Ships fast from the USA.
A remanufactured 48RE pump makes sense when a heavy-duty Dodge Ram is already on the bench for slipping, a delayed shift into gear, or a pump whine that has been getting louder each month, and you want the front of the transmission done once instead of gambling on a worn housing. This unit covers 48RE applications from 2003, the first year Chrysler built the 48RE for its heavy-duty trucks, through 2008, and arrives refinished and ready to bolt in.
The 48RE uses a gear-type front pump driven by the torque converter hub. Every pressure the transmission makes comes from it: line pressure for the clutches, bands and overdrive unit, converter charge, the lockup clutch apply, and oil for the cooler and lube circuits. Transmission Digest's write-up on the 48RE notes that its launch in 2003 brought changes to the pump stator, the torque converter and the clutch drum torque capacity, so this is not simply a 47RE pump with a new name. The stator support pressed into the pump body also keeps the turbine shaft centered in the converter; Sonnax points out that when its bushings wear, the shaft sealing rings cross-leak and rob converter and cooler flow.
Not every low-pressure 48RE needs a pump. A sticking pressure regulator or a worn valve body bore can drop line pressure too, and a cracked filter or bad pan gasket can make the pump suck air and whine. Hook up a line pressure gauge and check whether the pump can build maximum pressure at a fast idle; Sonnax describes the procedure in its gauge diagnostics article. Then measure cooler flow, since a plugged cooler can overheat the unit with a perfectly good pump. Start with our 48RE pump failure symptoms guide, and use the 46RE, 47RE and 48RE transmission guide to rule out the valve body and clutch packs.
This remanufactured pump is listed for the 48RE from 2003 through 2008, used mainly behind the 5.9L Cummins in Ram 2500 and 3500 trucks. Many heavy-duty Rams from the 2007.5-2008 model years came with a different automatic, so confirm the transmission tag on your case reads 48RE. Then compare the stator support splines, converter hub bore and casting with your old pump. If you are unsure, send us your year and VIN and we will confirm the match. A used 2004-2007 48RE pump is listed as a lower-cost alternative, and the rest of the lineup is on the 48RE collection page.
Pull the transmission and converter, then remove the pump with pullers so the body comes out square. Install a new front seal and confirm the bushing and converter hub are smooth. Torque the pump bolts evenly in a crisscross pattern and check input shaft end play before the case goes back in. Prime the gears with ATF+4 and use ATF+4 for the fill; it is the only fluid Chrysler specifies for this unit. Because a weak pump usually leaves heat damage behind, flush or replace the 48RE transmission cooler so debris does not return to the new pump, and if shift firmness is part of the complaint, a 48RE shift kit can go in with the valve body while it is out.
| Fits | 48RE 2003-2008 |
| Part type | Pump |
| Condition | Remanufactured |
| 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 a pump that has been rebuilt and refinished for reuse rather than pulled and resold as-is. It is listed as ready to install and covered by a 1-year warranty.
Only if your truck has the 48RE. Many 2007.5-2008 heavy-duty Rams use a different automatic, so check the tag on the case or send us your VIN to confirm.
Yes. The 48RE raises line pressure at converter clutch apply, and a worn pump or leaking stator support bushing lowers converter charge and apply pressure, which can show up as shudder or slip under load.
If the old pump failed or the fluid is dark, yes, or at least flush it. Debris trapped in the cooler returns to the new pump, and low cooler flow is a common cause of 48RE overheating.
No. A cracked filter, loose filter, or air leak on the suction side can cause the same noise. Check those and run a line pressure test first.
ATF+4 only. Pre-lube the gears with it on assembly and set the level hot with the engine idling in Neutral.
