10L90 Pump, new and ready to install. Fits the 10L90. Ships fast from the USA.
A GM ten-speed that has developed a growl or rattle from the front of the transmission, or a 10L90 that went to the bench with gear chips in the pan, usually comes back to the same three parts. This listing is the pump drive gear set for the 10L90: the converter drive gear, the idler gear with its ball bearing, and the splined pump driven gear. It is not a complete pump body or front cover. It is the gear train that turns the pump, sold as a set under interchange number 188711D, so you can replace worn gears without buying GM's full front cover assembly.
In the 10L80 and 10L90 the pump is not driven straight off the converter hub. A drive gear on the stator shaft support housing is turned by the converter, an idler gear riding on a press-fit ball bearing carries that motion across, and the idler spins the pump's driven gear. GM cuts these gears helical for quieter running. Every pound of line pressure the transmission makes, and with it every clutch apply, solenoid feed and the converter clutch, depends on that three-gear chain staying tight and intact.
Transmission Digest documented a 2021 GMC Yukon with exactly this noise: the idler gear had come loose enough to lift off its bearing by hand while the bearing stayed tight in the housing. A second 10L80 with the same failure followed shortly after, which suggests it will become a common repair as these units age out of warranty.
Separate pump drive noise from converter and valve body problems first. Pull the pan and check for metal, then run a line pressure test against spec. If pressure is low but the gears look fine, the main pressure regulator valve or feed limit valve may be the cause instead. Our 10L80 pump failure guide covers the noise and pressure checks, and the valve body wear and recall article explains the pressure-loss problems that mimic a weak pump.
This set is cross-listed for the GM 10L80/10L90 family used in 2017-up Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade and Camaro ZL1, and for the Ford 10R80. The two makers' gears are not the same: GM runs helical gears and Ford runs straight-cut gears, and they do not mesh with each other. Before you install, compare tooth angle, driven-gear spline and idler bearing size against the gears you removed. GM sells its drive and idler gears only as part of the stator shaft support housing, part 24053051, so the old assembly is your best reference. Not sure which you have? Send us the year and VIN. More GM ten-speed parts are on our 10L80/10L90 collection page, and the Ford-side version is our 10R80 oil pump drive gear set.
The work is done with the transmission removed and the front cover off. Use the two threaded puller holes in the idler gear to remove it rather than prying on the teeth. GM requires new bolts when the stator shaft support housing is serviced, so order them before you start. Inspect the pump pocket and converter hub, flush the cooler to clear any gear debris, and install a new filter. Refill with DEXRON ULV; GM lists a 7.7 L (8.1 qt) service fill for the 10L80, and the level must be set with the engine running at 75 to 80 C fluid temperature. A gallon of Green Diamond ULV fluid covers a top-off, and if the unit is open, a 10L90 overhaul kit supplies the seals you will disturb. Clear adaptives and complete a relearn drive afterward.
| Fits | 10L90 |
| Part type | Pump |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is the three-gear pump drive set: converter drive gear, idler gear with ball bearing, and pump driven gear. Reuse your pump body and front cover if they are not scored or damaged.
One documented cause is the idler gear loosening on its ball bearing in the stator shaft support housing. Transmission Digest reported cases on a 2021 Yukon and another 10L80 where replacing the gears cured the noise.
Only as a complete matched set with the pump driven gear. GM uses helical gears and Ford uses straight-cut gears, and mixing one style with the other will not mesh. Compare this set to your old gears before installing.
New stator shaft support housing bolts, a filter, the seals you disturb, and a cooler flush to remove any metal. Check the converter hub and pump pocket for wear while it is apart.
DEXRON ULV. Set the level with the engine running at 75 to 80 C fluid temperature, then clear adaptive values and complete a relearn drive.
