4L80E Pump 2004, remanufactured and ready to install. Fits the 4L80E. Ships fast from the USA.
If your 2004 Chevy or GMC 2500/3500 pickup, Suburban 2500, Express or Savana van with the 4L80E takes a long time to pick up Drive or Reverse once it is warm, slips in every gear under a load, or has a whine that climbs with engine RPM, the front pump belongs at the top of the suspect list. This listing is a remanufactured pump for the 2004 4L80E, the year GM changed things enough that an earlier pump will not simply bolt into the case. You get a finished assembly ready to install, not a core you have to rebuild yourself.
The torque converter hub drives the pump gears every second the engine runs. That flow is the only source of oil for the whole unit: the pressure regulator valve in the pump cover turns it into line pressure, feeds the converter and sends the excess to the cooler and lube. On a 2004 truck the computer commands that pressure through the EPC solenoid, and the pump has to have enough volume and tight enough clearances to deliver what is commanded. When the gears, bushing or cover wear, pressure drops across every range at once, which is why a pump problem feels different from a single bad clutch pack.
Check fluid level and condition hot first, then install a pressure gauge at the line port and record idle and stall readings in Park, Reverse, Neutral and Drive. Low in every range points to the pump or a big internal leak. Normal at idle but no rise under load points more toward the EPC circuit, so walk through our 4L80E EPC solenoid symptoms guide before you pull the transmission. Our 4L80E common problems guide covers the other failures that can mimic a pump, such as overdrive and converter clutch damage.
This pump is listed for 2004 4L80E transmissions. The important point is that 2004 is a dividing line: aftermarket conversion kits exist specifically to modify a 1997-2003 pump so it can go into a 2004 and later unit, which tells you the two are not a direct swap. If your truck is 1997-2003, use the 1997-2003 4L80E pump instead. Because transmissions get swapped between trucks, compare the casting numbers on the pump body and stator of your old pump with this one, or send us the year and VIN and we will confirm fitment before it ships. Everything we carry for this transmission is on the 4L80E parts page.
| Fits | 4L80E 2004 |
| Part type | Pump |
| Condition | Remanufactured |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Not as a straight bolt-in. Conversion kits are sold to modify a 1997-2003 pump for 2004 and later units, so the simplest route is the 2004 pump listed here.
A pressure gauge tells you. Low line pressure in every range at idle and stall points to the pump. Pressure that is fine at idle but will not rise under throttle points more toward the EPC solenoid or its wiring.
At minimum a front seal, pump gasket and O-ring, a filter, and fresh Dexron VI. Inspect the converter hub, and flush the cooler and lines.
It is listed for 2004. Later units may share the design, but send us the year and VIN or compare casting numbers with your old pump before ordering.
The pump itself does not need programming. If the transmission was removed or the battery disconnected, drive the truck gently for the first miles while the computer adapts shift timing.
