4L80E Pump 1997-2003, remanufactured and ready to install. Fits the 4L80E. Ships fast from the USA.
Owners of 1997-2003 Silverado and Sierra 2500/3500 trucks, Suburban 2500s and Express or Savana vans usually land here after the 4L80E starts flaring between gears, hesitates going into Reverse once it is hot, or develops a steady whine that follows the tachometer. Those are classic signs that the front pump can no longer hold pressure. This is a remanufactured pump for the center-lube generation of the 4L80E, delivered as a complete assembly so the repair is a swap rather than a bench rebuild.
For 1997, GM moved the 4L80E cooler return line off the pump and onto the center support so cooled oil lubricates the middle of the gear train. Transmission Digest and ATSG note that many internal hard parts were redesigned around that change, so a 1997-2003 unit is not the same inside as a 1991-1996 one. The pump still does the same core job: converter-driven gears produce flow, the pressure regulator valve sets line pressure and charges the converter, and the boost valve raises pressure on command. What changed is where the lube oil goes after the cooler, which is why pump and center support parts need to match the generation of the case.
A pump is a big job, so prove it. Gauge line pressure at idle and stall in each range and compare to the factory chart; a pump problem shows low readings everywhere. Stalling or stumbling when the shifter goes into overdrive or Reverse is a different story: Transmission Digest documents that an early-design sun gear shaft installed in a center-lube unit restricts the cooler and lube circuit and makes the converter clutch drag, so a previous rebuild with mixed parts can mimic pump trouble. Our GM 4L80E heavy-duty guide walks through the pressure tests, and the Silverado 2500 4L80E problems guide covers the faults owners of these trucks see most.
Listed for 1997-2003 4L80E transmissions. Do not use it in a 1991-1996 unit, which uses the earlier non-center-lube layout, and note that 2004 and later units take the 2004 4L80E pump. Because many of these transmissions have been swapped or rebuilt with mixed parts, compare the casting numbers on your old pump body and stator to this one, or send your year and VIN and we will check before it ships. The full range of parts for this unit is on the 4L80E collection.
| Fits | 4L80E 1997-2003 |
| 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.
Yes. In 1997 the 4L80E went to center-gearbox lubrication with the cooler return moved from the pump to the center support, and internal parts were redesigned around it. Use the pump that matches your generation.
Not directly. A 1997-2003 pump has to be modified with a conversion kit to go into a 2004 and later unit. Order the 2004 pump instead.
On 1999-2003 trucks Sonnax links idle surge to high factory EPC pressure at idle combined with the stock pressure regulator valve in the pump. Rule out vacuum leaks and engine faults too.
Front seal, pump gasket and O-ring, filter and fresh Dexron VI. Inspect the converter hub and flush the cooler lines.
Yes. Transmission Digest reports that an early sun gear shaft in a center-lube unit restricts the lube circuit and causes stalling when shifted into overdrive or Reverse.
