45RFE Pump 1999-2005, remanufactured and ready to install. Fits the 45RFE. Ships fast from the USA.
If your 45RFE Grand Cherokee, Dakota, Durango, Liberty or Ram 1500 has to be revved before it will pull away, takes a long breath before it picks up Reverse once the fluid is hot, or keeps logging a low line pressure code, the front pump is high on the suspect list. This is a remanufactured pump assembly for the 1999-2005 45RFE, supplied with the front seal in place, so the pressure the whole unit depends on comes back without reaming and rebuilding a worn pump on the bench.
The 45RFE pump is a gear pump bolted to the front of the case and turned by the torque converter hub, so it spins whenever the engine runs. It pulls fluid from the pan through the primary filter and supplies every clutch, the solenoid pack, the converter and the cooler circuit. The pump body is also a small valve body: it carries the pressure regulator valve plus the converter clutch regulator, switch and limit valves. Line pressure is controlled electronically, with the transmission controller reading a line pressure sensor and correcting through the pressure control solenoid. That closed loop is why a tired 45RFE pump usually announces itself with codes before it quits outright.
Sonnax lists low pressure, damaged pump gears, pressure regulation codes and TCC slip as the typical 45RFE and 545RFE pump wear complaints, and ties low pressure to pressure regulator valve wear or gear damage.
Rule out the cheap causes first. Check the fluid level hot with ATF+4; many 45RFE trucks have no dipstick tube, so low fluid goes unnoticed for years. Inspect the primary filter and its neck seal, because a pickup that pulls air acts exactly like a dead pump. Then watch desired versus actual line pressure on a scan tool as the fluid heats. Our 45RFE pump failure guide has known-good pressure readings and the full checking order, and the pressure control solenoid guide covers the solenoid and sensor faults that set the same codes on a healthy pump.
One complaint fools a lot of people. If the delay only happens on the first start after the vehicle sits overnight and is gone a few seconds later, look at Chrysler TSB 21-016-05 before buying a pump. It traces that drainback condition on 45RFE and 545RFE units to cooler return filter 04799662AB and calls for the same filter at a different suffix level.
This pump is listed for the 45RFE from 1999 through 2005. In that era the 45RFE and 545RFE family appeared in the 1999-2004 Grand Cherokee, 2000-2004 Dakota, 2003-2005 Ram 1500, 2002-2005 Liberty and 2004-2005 Durango, among others. Pump castings and the lube circuit changed over the production run, and Transmission Digest documented that the earlier pump uses spacer plate screws inside a main line pressure passage while the later design casts those holes shut. Compare the casting and any part number on your old pump with the photos before installing, or send us your year and VIN and we will check it. Other years are on the 45RFE parts page.
If clutch material is already in the pan, the pump alone will not save it; pair it with a 45RFE master rebuild kit. If the pressure codes point at worn bores downstream, the 45RFE valve body is the other half of the hydraulic repair.
| Fits | 45RFE 1999-2005 |
| 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 listed for 1999-2005 45RFE units. The pump casting and lube circuit changed during production, so compare your old pump's casting and any part number with the photos, or send your year and VIN before ordering and we will confirm it.
No. The pump sits behind the torque converter at the front of the case, so the transmission has to come out. Use that time to flush the cooler, replace both filters and inspect the converter hub.
Often it is not. Chrysler TSB 21-016-05 links delayed engagement after sitting overnight to cooler return filter 04799662AB letting the converter drain back. A worn pump is usually worst when the fluid is hot, not on a cold first start.
ATF+4 only. Chrysler lists a 5.2 L service fill on 4x2 and 6.2 L on 4x4, and 14 to 16 L after an overhaul. Check the final level with the fluid hot.
Inspect it rather than assume. If the hub is scored or worn, or the old pump failed from debris, the converter needs attention because it can damage the new seal and pump. A clean hub on a pump that simply wore out can usually be reused.
It can. The TCC regulator and switch valves live in the 45RFE pump body, so wear there causes converter slip, shudder or no lockup and TCC slip codes even when the converter itself is fine.
