4L80E Pump 1991-96, remanufactured and ready to install. Fits the 4L80E. Ships fast from the USA.
The first-generation 4L80E went into 1991-1996 Chevrolet and GMC 2500/3500 pickups, Suburban 2500s and full-size vans, and by now many of those transmissions have a lot of miles on the original pump. If yours is slow to engage after a long drive, slips in every gear when you are pulling a trailer, or whines in step with engine speed, this remanufactured 1991-1996 pump is the part that restores the pressure everything else depends on.
The pump sits behind the torque converter and is turned by the converter hub. Its gears create all the oil flow in the transmission, and the valves in the pump cover shape it: the pressure regulator sets line pressure and supplies the converter, and the boost valve raises line pressure when the computer or Reverse demands it. On these early units the cooler return still came back through the pump. GM did not move it to the center support until 1997, when the center-lube design arrived and many internal parts changed with it, so an early pump and a later one are not interchangeable.
On 1994-1996 trucks with the 6.5L diesel there is a known trap. Transmission Digest explains that the electronic injection pump introduced in 1994 uses the accelerator pedal position sensor to command both fuel and transmission line pressure. A worn injection pump that over-fuels lets the truck pull away on very little pedal, so the computer commands too little line pressure and the clutches slip and burn. A new transmission pump will not cure that. Put a gauge on the line pressure port, compare readings to spec, and if pressure is fine at idle but never rises with throttle, check the fuel side and the EPC circuit. Our GM 4L80E complete guide and Sierra 2500 4L80E problems guide cover the rest of the diagnosis.
Listed for 1991-1996 4L80E transmissions. It is not for 1997 and later center-lube units; those take the 1997-2003 4L80E pump or the 2004 version. The early years saw several running changes, and many of these transmissions have been rebuilt or swapped, so compare the pump body and stator casting numbers to your old pump, or give us the year and VIN and we will confirm before it ships. All of our early-unit parts are on the 4L80E collection page.
| Fits | 4L80E 1991-96 |
| 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.
No. In 1997 the 4L80E moved to center lube, with the cooler return relocated from the pump to the center support, and internal parts were redesigned. Use a 1991-1996 pump.
Possibly, but check the injection pump too. On 1994 and later 6.5L trucks a leaking injection pump over-fuels, the truck uses less pedal, and the computer commands too little line pressure.
Sonnax links it to a worn boost valve sleeve and leaking balance plug in the pump cover, letting reverse boost oil into the torque signal circuit.
A front seal, pump gasket and O-ring, a new filter and Dexron VI. Inspect the converter hub and flush the cooler and lines.
Match the casting numbers on your old pump body and stator, or send us the year and VIN before ordering.
