48RE Pump 2006, used and ready to install. Fits the 48RE. Ships fast from the USA.
A 2006 Ram 2500 or 3500 Cummins that whines with engine speed, takes a few seconds to go into Drive or Reverse after sitting, or slips in every gear once the fluid is hot is often telling you the front pump is worn. This used 48RE pump assembly for 2006 replaces the worn unit with a working OEM pump so the transmission gets back the pressure it depends on, without paying for a new pump.
The pump sits at the front of the case, driven by the torque converter hub, and its inner and outer gears supply every bit of oil pressure the transmission uses: line pressure for the clutches and bands, converter charge, lockup apply and cooler and lube flow. The 48RE leans on that pump harder than the older RE units. Sonnax reports that a 48RE raises line pressure roughly 22-28 psi in fourth gear or with the converter clutch applied, compared with about 10-15 psi on a 46RE or 47RE. A pump that has lost volume from gear or pocket wear cannot keep up with that demand behind a Cummins, and the result is slip and heat.
The pump body also carries the stator support. Sonnax notes the support keeps the turbine shaft aligned with the converter, and worn bushings there let the shaft sealing rings cross-leak, robbing converter and cooler flow even when the gears themselves are still usable.
Put a pressure gauge on the line tap before you buy anything. A healthy pump should reach minimum line pressure at idle and climb to maximum when you force full pressure at a fast idle; a gauge that bounces with a whine can also mean a cracked filter or an air leak on the suction side, which is a much cheaper fix. Check cooler flow too: GEARS Magazine puts the minimum at about one gallon per minute on these units. Our 48RE pump failure symptoms guide walks through the full test, and the 46RE, 47RE and 48RE guide helps you separate pump problems from valve body and clutch wear.
This pump is listed for the 48RE in a 2006 Ram 2500/3500 with the 5.9L Cummins. Because this is a used assembly, compare the casting, stator support spline count and converter hub size against your old pump before installing, and confirm the input shaft is the matching style. If you are not sure, send us your year and VIN and we will check it. Other year ranges are available as the 2003-2008 48RE pump, and everything else for this unit is on the 48RE collection page.
The pump comes out only with the transmission out of the truck and the converter removed. Install a new front seal and inspect the pump bushing and the converter hub; a scored hub will chew a new seal and bushing. Torque the pump bolts evenly so the body is not distorted, check input shaft end play, and lube the gears with ATF+4 so the pump primes on first start. If the old pump failed from debris, look hard at the clutches and planetary set while the case is open; a 2006 48RE planetary and a fresh 48RE TCC solenoid are common add-ons. Refill with ATF+4 and set the level hot, idling in Neutral.
| Fits | 48RE 2006 |
| 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 the 2006 48RE. Many 48RE pumps interchange within the 5.9L Cummins years, but because this is a used assembly, compare the casting, stator splines and hub size with your old pump or send us your year and VIN first.
A whine that follows engine RPM in every range, including Park, usually points to the pump. A cracked filter or suction-side air leak can make the same noise, so check those and run a pressure test before replacing the pump.
Install a new front seal and bushing, inspect the converter hub, and replace the converter if it carries debris. Check the cooler for restriction too, since low cooler flow is a common cause of 48RE overheating.
It can. The 48RE raises line pressure at lockup, and a pump or stator support that leaks internally lowers converter charge and apply pressure, so lockup can slip or shudder under load.
Use ATF+4 only. Pre-lube the gears with ATF+4 on assembly and check the final level hot, with the engine idling and the selector in Neutral.
