RE4F04A Pump, remanufactured and ready to install. Fits the RE4F04A. Ships fast from the USA.
The RE4F04A is the large-case front-drive four-speed behind the V6 in the Nissan Maxima, Quest and Infiniti I30, the four-cylinder Altima, and the Mercury Villager. When one of these starts dragging into gear after sitting, whines with engine speed, or slips everywhere once it is hot, a worn front pump is a common reason. This is a remanufactured RE4F04A pump assembly, ready to bolt in during an overhaul or a pump-only repair.
The pump sits at the front of the case, right behind the torque converter, and the converter hub drives it every time the engine turns. It pulls fluid through the filter and supplies all of the line pressure that applies the clutches and band, feeds the valve body, charges the converter and sends fluid to the cooler. The valve body and pressure control solenoid then regulate that supply. If the pump cannot keep up because its gears, body pockets or bushing are worn, everything downstream sees low pressure at once. That is why pump wear shows up in every range, not just one gear.
Keep in mind that this transmission has other known faults that feel similar. TransGo notes that the direct (3rd) clutch inner seal leaks on these units and can cause dropping out of gear at a stop when hot, and that uncontrolled line pressure can blow out a drum. A pump does not fix either of those, so diagnose before you buy.
Check the fluid level hot first; TransGo points out that the factory level is low and recommends hot fluid about 1/4 to 3/8 inch above the full mark. Then put a gauge on the line pressure port and compare idle and stall readings in each range, as covered in our line pressure testing guide. Pressure that is low in every range points at the pump or the pressure regulation side; low in one range points at a leaking clutch circuit instead. With the transmission out, look at the converter hub and pump bushing, using our converter hub and pump bushing wear guide. A scored hub will chew up a new pump bushing, so a damaged converter needs replacing at the same time.
TransGo lists the RE4F04A A and V models in the 1993-1999 Altima, 1992-1999 Maxima (plus the 2004 Maxima SL), 1993-2002 Quest, 1993-2002 Mercury Villager and 1995-1999 Infiniti I30. The later B-version large case went into the 2000-2003 Maxima, 2000-2006 Altima, 2000-2006 Sentra SE-R 2.5L, 2000-2001 I30 and 2002 I35. The small-case RE4F03 in the Sentra, 200SX and G20 is a different transmission and does not take this pump. This listing does not name a year range, so compare it with the pump you remove: bolt pattern, stator shaft and the converter hub bore should all match. If you are not sure, send us your year and VIN before ordering. More parts for this unit are under hard parts.
| Fits | RE4F04A |
| Part type | Pump |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Per TransGo, A and V models are in the 1993-1999 Altima, 1992-1999 Maxima, 1993-2002 Quest, 1993-2002 Mercury Villager and 1995-1999 Infiniti I30. B models follow in the 2000-2003 Maxima, 2000-2006 Altima, Sentra SE-R 2.5L, 2000-2001 I30 and 2002 I35. Match the pump to the one you remove or send us your year and VIN.
Most Sentras, the 200SX and the Infiniti G20 use the small-case RE4F03, which is a different transmission. The 2000-2006 Sentra SE-R 2.5L is the exception and uses the large-case RE4F04 family.
If line pressure is low in every range and the pump is worn, yes. If pressure is normal or only one gear slips, the cause is more likely a leaking clutch seal, worn clutches or a valve body problem. Do a line pressure test before replacing the pump.
A front seal, pump gasket and O-ring, the transmission filter and fresh fluid. Inspect the converter hub; replace the converter if the hub is scored, and flush the cooler if the old pump shed metal.
Check it hot with the engine running in Park. TransGo notes the factory mark is low and recommends a hot level about 1/4 to 3/8 inch above full.
