10L80 Overhaul Kit

This is a Transtec overhaul kit, maker part 2753, for the GM 10L80 ten-speed that sits behind the 5.3L and 6.2L V8s and the 3.0L Duramax in Chevrolet Silverado 1500 and GMC Sierra 1500 pickups and in the Tahoe, Suburban and Yukon. It is the seal and gasket half of a rebuild, supplied without pistons, and it is the part you want once a 10L80 is coming out of the truck for slipping, a soft or late engagement into Drive, or a leak you cannot chase down from underneath. If your unit has already burnt its clutches, you will also need frictions, so read the install notes before you build your parts list.

What the overhaul kit does in a 10L80

A 10L80 makes ten forward gears by holding four of its six clutches at once, and every shift is a timed hand-off of pressure from one clutch to the next. That pressure starts at the pump, is shaped by the valve body solenoids, and then has to travel through the case, across rotating sealing rings on the shafts and drums, and behind a piston before the clutch clamps. The kit replaces the gaskets, O-rings, lip seals and sealing rings along that route. When those parts harden or wear, the clutch takes longer to fill and the transmission control module keeps adding pressure or time to cover it. Eventually the adaptive values run out of room and the driver feels a flare, a bump, or a gear that slips under load.

Symptoms that point to an overhaul

• Slipping or flare between gears while towing or climbing, which gets worse as the fluid heats up
• A pause of a second or more before the truck moves after shifting into Drive or Reverse on a cold morning
• Harsh or binding shifts that return shortly after an adaptive relearn
• Fluid weeping at the pan, case joints or the output seal
• Burnt fluid or clutch material in the pan along with a ratio or performance code

How to confirm before you tear it down

Many 10L80 shift complaints are not seals at all. ATRA notes that high-mileage harsh shifts usually trace back to the valve body, and that codes stored in other modules can change shift behavior, so scan every module before you blame the transmission. Start with the 10L80 valve body symptoms and testing guide. A transmission that shows code P175E, shift limiting active, is protecting itself because of bad sensor data, not worn seals. If the pan shows friction material, or the truck is slipping in the gears that use the 3-4 clutch, the 10L80 3-4 clutch failure guide explains what you will find inside, and in that case this kit is part of the repair rather than the whole repair.

Fitment

The maker catalogs kit 2753 for the 10L80 and 10L90 from the start of production. The applications it names are early trucks and cars: the 2017-2018 Silverado and 2018 Sierra with the 3.0L, 5.3L or 6.2L, the 6.2L Camaro, and the 2018 Cadillac CT6. Those are Generation 1 transmissions. GM moved to a Generation 2 valve body around late 2019 and also built shift-by-wire and auto start-stop versions, so a 2020-up truck may need a different kit. Scan the RPO QR label on the driver door B-pillar to identify your unit, or send us your year and VIN and we will check it before it ships. Newer owners should also compare the 10L80 overhaul kit for 2020-2026. Everything else for this transmission is on the 10L80 and 10L90 parts page.

Install notes

• No pistons are included. Inspect every bonded piston lip for cuts, hardening or heat damage, and order replacements before assembly if the unit ran hot.
• Frictions and steels are separate. If the clutches are glazed or burnt, add a 10L80 clutch module rather than reusing worn material.
• Set clutch clearances to specification. ATRA warns that clearances outside the range cause harsh or binding shifts the computer cannot correct.
• Do not lock the cooler bypass valve in full bypass. Running below the adaptive learning temperature range causes harsh shifts.
• With the valve body off, check the solenoids. A tired set can be replaced with the 10L80 solenoid kit.
• Refill with Dexron ULV. GM lists an 8.1 quart service fill for the 10L80, and a dry unit takes more. Set the level hot, clear the adaptive values and run the fast learn with a scan tool.

Does this kit fit my 2018 Silverado 1500 with the 5.3L?

The maker lists the 2017-2018 Silverado with the 3.0L, 5.3L and 6.2L, and the 2018 Sierra, so a 2018 5.3L truck is one of the named applications. Check the RPO label or send us your VIN to be sure.

Are pistons included?

No. This is the version without pistons. You reuse your bonded pistons if their lips are in good shape, or buy them separately if they are damaged.

Will it fit a 2021 or newer truck?

It might not. Those trucks use the Generation 2 valve body and may have shift-by-wire or start-stop hardware. Send us your year and VIN, and compare our 2020-2026 overhaul kit.

What else should I buy with it?

A new filter, enough Dexron ULV for a dry fill, and frictions and steels if the clutches are worn. Many builders also replace the solenoids while the valve body is off.

Do I need a scan tool after the rebuild?

Yes. Clear the adaptive values and run the fast learn after the fluid level is set hot. Without a relearn, a fresh 10L80 can shift harshly until it learns the new clutches.

• 10L80 Valve Body Symptoms and Testing
• 10L80 3-4 Clutch Failure: Symptoms and Fix
• 10L80 Pump Failure Symptoms and Replacement
• 10L80 Cooler Line Replacement Guide