6L90 Pump 2006-2018, new and ready to install. Fits the 6L90. Ships fast from the USA.
Before you order, know what is in the box: this is not a full pump assembly. It is the new rotating group for the inside of a 6L90 pump, the pieces that actually wear. The photo shows the pump slide, the rotor, a full set of vanes, the vane guide rings, the slide seal and the large O-ring seals. It is meant for the builder who has a 2006-2018 6L90 apart on the bench, out of a heavy-duty Silverado or Sierra, an Express or Savana van or a Camaro ZL1, and has found a scored rotor, chipped vanes or a worn slide, but a housing and cover that are still good.
The 6L90 runs a variable-displacement vane pump. The torque converter hub turns the rotor, and the vanes slide outward against the bore of the pump slide, trapping oil and pushing it into the pressure circuit. The slide pivots against a spring: swung one way it makes the pumping chamber bigger and the pump moves more oil, swung the other way output drops so the pump is not wasting power at cruise. The pressure regulator in the pump cover controls that slide position. When the slide bore is scored, a vane sticks in its slot or the rotor faces wear, oil leaks past the vanes instead of being pumped, and the pressure every clutch depends on falls away. Sonnax notes that at high engine speed, pressure and centrifugal force on the vanes already push the slide toward low volume, so a worn group loses even more at the top end.
Pressure test first: low pressure in every range points to the supply side, and the 6L90 pump failure guide walks through what to measure. Once the pump is apart, inspect the rotor faces, vane tips and the slide bore, and check the pocket in the bell housing and the face of the cover. If those mating surfaces are scored, new internals alone will not seal, and you need a cover or housing too. Shifting complaints that are not pressure related are covered in the 6L90 Silverado 2500 shift problems guide.
The listing covers the 6L90 from 2006 through 2018. Pump internals are shared across a wide span of the 6L family, but this listing is sold for the 6L90, so measure your old rotor and slide against the new parts and compare vane width before you assemble. If anything looks different, stop and send us your year and VIN. The full list of what we carry for this unit is on the 6L90 transmission parts page.
If the cover face is scored, pair this kit with our remanufactured 6L90 pump cover assembly. For a full refresh, the 6L90 master rebuild kit supplies the seals, gaskets and frictions that should be replaced while the unit is open.
| Fits | 6L90 2006-2018 |
| Part type | Pump |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
No. It is the internal rotating group: slide, rotor, vanes, vane rings and seals as shown in the photo. You reuse your bell housing and pump cover, as long as their faces are not scored.
When the rotor, vanes or slide are worn but the pocket in the bell housing and the cover face are still smooth. If either mating surface is scored, replace that part as well or the new internals will leak.
Check the photo for exactly what is included. If your slide spring is weak or broken, replace it; the spring holds the slide in the high-output position and directly affects line pressure.
Lubricate the parts with Dexron VI, the same fluid the 6L90 runs on, and prime the pump before the first start.
Reset the transmission adapts with a scan tool and complete a relearn drive so shift timing matches the restored pressure.
