6L80E Transmission Master Rebuild Kit with Filter

When a 6L80E has burned a clutch pack, the friction material does not stay in the drum. It ends up in the filter, the cooler, the valve body bores and the pressure control solenoids. This master kit is built for that situation: it has the complete friction and steel plate sets, a new internal filter and pan gasket, and the full gasket, lip seal, O-ring and Teflon sealing ring package for the GM 6L80E and the heavier 6L90E. It cross-references to 24236931, 34664P, 195940, 135710D, 515709 and 195901XLS, and it covers the widest truck and van spread in our 6L80 lineup, from 2006 Corvette through 2022 Silverado 2500HD and 3500HD and the Express 4500 and Savana cutaway chassis.

What a master rebuild kit does in a 6L80

The 6L80 is a clutch-to-clutch six-speed. Three rotating clutches (1-2-3-4, 3-5-Reverse and 4-5-6) and two holding clutches (2-6 and Low/Reverse) are combined in pairs to make each gear, and the TCM times every apply and release through pressure control solenoids. Nothing in the box is decorative: once a pack has slipped, the plates next to it are glazed, the sealing rings that feed it have been running hot, and the old filter is holding the debris. Renewing every plate and every seal at once is what lets the TCM learn fresh, consistent fill times after the rebuild instead of chasing one tired pack.

Symptoms that bring this kit to the bench

• No 3rd, 5th or Reverse at the same time, the classic burned 3-5-R pack
• Slipping or flaring on the 4-5 or 5-6 upshift as the 4-5-6 clutch wears
• Black, burnt-smelling fluid with fiber and metal in the pan
• Converter shudder that went on long enough to overheat the fluid
• Seepage from the pan, front pump seal or output seal on a high-mileage tow rig

How to confirm before you buy

A master kit fixes worn clutches and seals, not a bad controller. Codes such as P0716, P0717 or P0751 point at the input speed sensor, shift solenoids or the TEHCM, and those need diagnosis on their own. ATRA's GEARS magazine recommends comparing actual line pressure at the mainline port with the commanded pressure on a scan tool: correct pressure plus slipping gears means the packs are done. Our 6L80 common problems and fixes guide lays out which symptoms are clutch failures and which are electrical, and the 6L80 pump failure symptoms guide covers the pump checks.

Fitment

Listed coverage: Chevrolet Avalanche 2008-2013, Camaro 2009-2015, Corvette 2006-2018, Tahoe and Suburban 1500 2008-2020, Suburban 2500 2008-2013, Suburban 3500 2016-2019, Silverado 1500 2008-2022, Silverado 2500/2500HD and 3500HD 2007-2022, Express 1500-3500 2009-2021 and Express 4500 2010-2019, and GMC Savana 1500-4500 plus the matching Sierra years. The 6L90 is a longer case with heavier internals, so confirm whether your unit is tagged MYC (6L80) or MYD (6L90) and compare the old plates to the new ones before you start stacking. If you are unsure, send us your year and VIN and we will check it. More parts for this unit are in the 6L80 transmission collection.

Install notes

• Flush the cooler and cooler lines, or replace the cooler, if the old fluid was black. Debris left in the cooler circuit goes straight back into the new frictions.
• Install the new filter with a new filter neck seal. GM bulletin 23-NA-224 split the old filter and seal kit 24236933 into filter 24236517 and seal 24225347, so do not reuse the old seal.
• Replace every Teflon sealing ring, then air-check each clutch circuit before the valve body goes on. A 3-5-R and 1-2-3-4 drum leak tester makes this repeatable, and an input shaft seal ring expander and resizer keeps the new rings from being cut on assembly.
• Inspect the piston housings for cracks and the pump for scoring. Wave plates, pistons and hard parts are not included.
• Soak frictions in Dexron VI for about 20 minutes, set each pack clearance with selectives, refill with Dexron VI and run a fast learn so the TCM relearns clutch fill.

If the valve body bores are worn from debris, the 6L80 valve body end plug kit is a cheap fix to do while the body is off.

Does this kit fit the 6L90E in my Silverado 2500HD or Express van?

Yes, the kit is listed for both the 6L80E and 6L90E, including 2007-2022 Silverado 2500HD and 3500HD and 2009-2021 Express and Savana vans. The 6L90 uses heavier internals, so lay the old plates next to the new ones and confirm counts and thickness before assembly, or send us your year and VIN to check.

Is a new filter really included?

Yes. This version includes the internal filter and pan gasket along with the frictions, steels, gaskets, seals, O-rings and sealing rings. Install it with a new filter neck seal; GM now supplies the filter (24236517) and seal (24225347) as separate numbers.

What is not in the box?

Hard parts and pistons. There is no wave plate, piston housing, pump, drum, bushings or solenoid body in this kit. If your pistons or housings are cracked or the bonded lips are hard, order those separately.

My 6L80 lost 3rd, 5th and Reverse. Will this kit fix it?

That pattern almost always means the 3-5-R clutch burned. The kit replaces those frictions and steels and the seals that feed the pack, but you also need to inspect the 3-5-R housing for cracks and air-check the circuit, because a leak there is what burns the pack in the first place.

What fluid do I use after the rebuild?

Dexron VI only. Soak the new frictions in it before assembly, fill using GM's level check procedure at operating temperature, and then do a transmission adapt reset and fast learn with a scan tool.

• 6L80 Common Problems and Fixes: The Seven Failures That Actually Show Up
• 6L80 Pump Failure Symptoms and Replacement
• 6L80 Escalade Common Problems and Fixes
• 6L80 Corvette Common Problems and Fixes