10L80 Overhaul Kit 2018-2024

This kit is the gasket, sealing ring and seal set for a GM 10L80 or 10L90 ten-speed teardown, sold by its maker as part 105002 and referenced to the KP33900PX overhaul kit. It is the budget-minded way to reseal a Silverado 1500, Sierra 1500, Tahoe, Suburban, Yukon or Escalade transmission when the clutches are still serviceable but the unit leaks, engages late, or loses pressure as it warms up. Read the fitment section closely: the listing title reads 2018-2024, but the maker describes the kit as correct for 2018-2019 units only.

What the gasket and ring set does in a 10L80

Clutch apply pressure in the 10L80 travels a long way. It leaves the pump, passes through the valve body, enters the case, and then crosses into spinning shafts and drums through cast-iron and Teflon-style sealing rings before it reaches a piston. Each joint along that path is sealed by a gasket, an O-ring or a ring riding in a groove. Sonnax names sealing ring and hub bushing wear among the biggest causes of lost charge pressure in these units, which leads to slipping, lockup complaints and overheating. This set renews the rings, seals and gaskets along that path, so the oil the pump makes actually reaches the clutch it was sent to.

Symptoms of leaking seals and rings

• Engagement that takes a second or more when the truck is cold
• Shifts that soften or slip after a long highway run or towing
• Converter lockup complaints and high fluid temperature readings
• Fluid seeping at the pan gasket, case joints or cooler line fittings
• A drum that will not hold air when you air check it on the bench

How to confirm before ordering

Pressure loss can start in the pump or the regulator valve just as easily as in a ring, so check those first with the 10L80 pump failure guide. Electrical faults are covered in the pressure control solenoid guide. Once the unit is apart, air check each drum: a leak you can hear at a ring or piston confirms this kit, and burnt frictions mean you also need a clutch pack.

Fitment

The kit maker lists it for GM 10L80 and 10L90 transmissions and states 2018-2019 only, which places it in the Generation 1 period before GM moved to Generation 2 valve bodies around late 2019. Our listing title says 2018-2024 because of how the part is catalogued, but we will not ship it for a later truck without checking. If yours is a 2020 or newer build, send us your year and VIN, and also look at the 10L80 overhaul kit for 2020-2026. You can identify the unit from the RPO QR label on the driver door B-pillar. Other parts for this transmission are on the 10L80 and 10L90 parts page.

Install notes

• The set does not include frictions, steels or pistons. If the frictions are glazed, pair it with the 10L80 friction clutch module kit and a new filter.
• Inspect bushings and ring lands while the shafts are out. A new ring will not seal in a worn groove or against a worn bushing.
• Lubricate rings with assembly gel and size them before installing the mating drum.
• Air check the complete assembly through the pump before it goes into the case.
• With the valve body off, look at the 10L80 pressure control solenoid and the bores for wear, since 2019 units fall inside GM's valve body recall window for some models.
• Refill with Dexron ULV, about 8.1 quarts for a service fill and more for a dry unit, check it hot, then clear adaptives and run the fast learn.

Does it fit my 2022 Silverado?

The kit maker lists it as 2018-2019 only, which is Generation 1. For a 2022 truck, send us your VIN first, and compare the 2020-2026 kit, which is the more likely match.

Is this the same as KP33900PX?

It is referenced to KP33900PX and sold under the maker's part 105002. Both are 10L80 and 10L90 gasket and seal sets, but fitment notes differ, so match it to your unit year.

Does it come with clutches?

No. It contains gaskets, sealing rings and seals. Frictions, steels and pistons are separate purchases if your unit needs them.

Will it work on a 10L90?

The maker lists it for both the 10L80 and the 10L90 in the 2018-2019 window. Confirm with your RPO code or VIN.

What has to happen after installation?

Fill with Dexron ULV, check the level hot by the GM procedure, clear the adaptive values and run the fast learn with a scan tool.

• 10L80 Pump Failure Symptoms and Replacement
• 10L80 Pressure Control (EPC) Solenoid Symptoms
• GM 10L80 Transmission Problems: The Valve Body Wear Behind the Wheel-Lock-Up Recall
• 10L80 Shift Solenoid Symptoms, Testing and Replacement