48RE Pump 2004-2007, used and ready to install. Fits the 48RE. Ships fast from the USA.
If your 2004-2007 Ram 2500 or 3500 with the 48RE sits in gear for a second or two before it moves, howls in step with the engine, or starts slipping everywhere after a long pull with a trailer, the front pump belongs on the suspect list. This is a used OEM 48RE pump assembly for the 2004-2007 trucks, a lower-cost way to replace a pump with worn gears or a chewed-up body when a rebuild is already open on the bench or the unit is out for a front-end repair.
Everything hydraulic in a 48RE starts at the pump. The converter hub turns the inner gear, the outer gear rides in a pocket machined into the pump body, and the oil they move becomes line pressure for the front and rear clutches, both bands and the overdrive unit, plus converter feed, lockup apply and the cooler and lube circuit. On a diesel 48RE that demand peaks in fourth and at lockup: Sonnax documents that the 48RE valve body adds roughly 22-28 psi of line pressure in those conditions, about double the 10-15 psi rise on a 46RE or 47RE. A pump that is fine at idle can fall short right when the truck is working hardest.
Gear and pocket wear is the usual culprit. GEARS Magazine describes a billet replacement gear set for exactly this failure, built to the OE 10/11 lobe layout with tight clearances because any extra gap shows up as lost pressure and volume.
Gauge the line pressure tap first. The Sonnax pressure gauge method is simple: check minimum line at idle, then force maximum line at a fast idle and see whether the pump can build it. If the needle bounces and the noise comes with it, rule out a cracked filter or a suction-side air leak before you condemn the pump. Measure cooler flow as well; GEARS puts the floor at about a gallon per minute. Our 48RE pump failure symptoms guide covers the full test, and 48RE Cummins transmission problems explains how pump wear ties into overdrive and lockup complaints.
This pump is listed for the 48RE in 2004-2007 Ram 2500 and 3500 trucks, the 5.9L Cummins years. It is a used part, so before installing compare it to your old pump: the casting, the stator support splines, the converter hub bore and the bolt pattern should all match. If anything looks different, send us your year and VIN and we will check it against your unit. Need a different version? The remanufactured 2003-2008 48RE pump and the 2006 48RE pump are also available, and the full parts lineup is on the 48RE collection page.
The transmission and converter come out to reach the pump. Fit a new front seal, check the bushing, and look closely at the converter hub, because a grooved hub will wear a fresh seal and bushing quickly. Draw the pump bolts down evenly so the body seats square, verify input shaft end play, and coat the gears with ATF+4 so the pump picks up oil on the first start. Use ATF+4 only; Chrysler's 2006 Ram capacity sheet lists about 8 pints for a service and 29-33 pints after an overhaul. Check the level hot, idling in Neutral. If debris took out the old pump, a 48RE overhaul kit is the sensible companion, and a pump that has been starved often leaves a scored valve body behind it.
| Fits | 48RE 2004-2007 |
| Part type | Pump |
| 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 listed for 2004-2007. A 2003 or 2008 unit may well take the same pump, but check the casting, stator splines and hub bore against your old pump, or send us the year and VIN, before ordering.
A used OEM pump costs less and is a good fit when the gears or body in your pump are worn and you are already doing the labor. If you want a refinished unit, the remanufactured 2003-2008 pump is the other option.
A whine that follows engine speed in Park and Neutral usually comes from the pump, but a cracked filter or an air leak on the suction side can sound the same. A pressure test will separate them.
A new front seal and bushing, a careful look at the converter hub, and a new filter. If the old pump left debris in the pan, replace the converter and inspect the clutches and valve body too.
Chrysler lists about 8 pints for a pan service and 29-33 pints after an overhaul on the 48RE. Final level is set hot with the engine idling in Neutral.
