10L80 Overhaul Kit 2020-2026, new and ready to install. Fits the 10L80. Ships fast from the USA.
Read this first: although this listing is titled as an overhaul kit, the item is a genuine GM/ACDelco fluid service kit for the 10L80 ten-speed behind the 3.0L Duramax diesel (LM2 and LZ0) in 2020-2026 Silverado 1500, Sierra 1500, Tahoe, Suburban, Yukon and Escalade. It contains the internal transmission filter, the rubber pan gasket shown in the photo, and nine one-quart bottles of ACDelco Dexron ULV (10-4107). It is the kit you want for a scheduled pan-off service, for fluid that has gone dark at high mileage or after towing, or for refilling the unit after you have pulled the pan to look for debris. It does not contain clutches, steels or piston seals.
Every clutch apply in the 10L80 is a precisely timed pressure event. The TCM hands one clutch off to the next with roughly 0.3 seconds of overlap, and it keeps adjusting those apply pressures as the unit wears. That only works when the fluid has the viscosity and friction properties the calibration was written around and when the pump can draw clean oil through an unrestricted filter. Dexron ULV is an ultra-low-viscosity fluid, so mixing in an older Dexron VI or a generic multi-vehicle fluid changes how the clutches apply and how the adapts behave. A diesel truck that tows sees heat and shear that wear fluid faster than a light-duty gas truck, which is why the service matters more on the Duramax.
Fresh fluid and a new filter will not fix a mechanical fault. When the pan comes off, look at what is on the magnet and in the filter. A fine gray paste is normal; flakes of friction lining or bright metal point to wear inside the unit. If shifts are erratic or a clutch flare comes with a code, read our 10L80 valve body symptoms and testing guide and the 10L80 valve body recall article before you assume a service will cure it. Slow engagement after a fill can also be a pump or priming issue, covered in our 10L80 pump failure guide.
The listing ties this kit to 2020-2026 GM trucks and SUVs with the 10L80 and the 3.0L Duramax (RPO LM2 or LZ0). The OE numbers on the listing are 24294355 and 24297886, with 24269333 and 24290546 shown as superseded numbers, and ACDelco TF937 for the filter. Gas-engine 10L80 and 10L90 applications are cataloged under different filter numbers in some years, so match the old filter in your pan or the RPO code on your glovebox label, or send us your year and VIN and we will confirm before it ships. Other 10L80 parts are on our 10L80 collection page.
| Fits | 10L80 2020-2026 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | ACDelco |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Despite the listing title, it is a fluid service kit: the internal filter, the pan gasket and nine quarts of ACDelco Dexron ULV. For a rebuild you need a seal and gasket overhaul set plus frictions and steels.
It is listed for the 10L80 behind the 3.0L Duramax (LM2 and LZ0) in 2020-2026 trucks. Gas-engine models can use a different filter number, so compare the old filter or send us your year and VIN before ordering.
For a pan-off service, yes. GM lists the 10L80 service fill at 8.1 quarts. A complete drain with the converter emptied, or a flush, needs extra fluid.
No. The 10L80 is calibrated for Dexron ULV. Using another fluid changes clutch apply feel and can cause shift complaints the TCM cannot learn out.
With the engine running and the fluid at the specified temperature on a scan tool, remove the check plug and let excess fluid drain until it drips, then reinstall the plug.
Usually not for a straight fluid and filter change. If the truck had internal repairs, a valve body swap or solenoid work, follow the GM relearn and programming steps for that repair.
