6L80 Master Rebuild Kit, new and ready to install. Fits the 6L80. Ships fast from the USA.
If your Silverado, Sierra, Tahoe, Yukon, Escalade, Express van or Corvette has started slipping on the 2-3 or 4-5 shift, flaring under load, or dumping dark fluid full of friction material when you drop the pan, the transmission is past a fluid change. This 6L80/6L90 master rebuild kit is the box of soft parts you need once the unit is out and on the bench: friction plates, the overhaul gasket and seal set, and a new pan filter. It is built for a full teardown, not a patch.
The 6L80 is GM's six-speed rear-drive automatic. It makes its six ratios with five clutches: three rotating packs inside the input housing (1-2-3-4, 3-5-Reverse and 4-5-6) and two stationary packs held to the case (2-6 and Low/Reverse). Every one of those packs is applied by a rubber-sealed piston, and the oil to apply them travels across sealing rings and through valve body gaskets. When friction lining wears thin or a seal hardens, clamping force drops and the computer sees slip. A master kit renews all of those wear surfaces at the same time, so you are not rebuilding the 3-5-R pack today and pulling the transmission again next year for the 4-5-6.
Rule out the cheap causes first. Fluid level on a 6L80 is checked at the case check plug with the fluid at operating temperature, and a low level alone can mimic a slip. Next, compare actual line pressure against the commanded pressure; a weak pump or a worn valve body will give you the same complaint as worn clutches, and a new clutch set will not cure it. Our 6L80 common problems guide walks through the order we test in, and the 6L80 pump failure guide covers the pressure checks that separate a pump problem from a clutch problem.
The listing covers 6L80, 6L80E, 6L90 and 6L90E units in 2006-2018 Escalade, Escalade ESV and EXT, 2006-2018 Corvette, 2008-2022 Silverado 1500 and Sierra 1500 applications, 2007-2022 Silverado and Sierra 2500HD and 3500HD, 2009-2021 Express and Savana, 2008-2013 Avalanche, CTS-V, STS-V and the 2010-2015 Camaro (the fifth-generation Camaro started production as a 2010 model). It interchanges with the 24236931, KP33900JAX, KP33900JBX, 195940, 135710D and 195804X kit numbers. Pull the RPO sticker in the glovebox or console before ordering: MYC is a 6L80, MYD is a 6L90, and MYB is the lighter 6L50, which this kit is not listed for. The 6L90 runs a longer case and a higher clutch count than the 6L80, so count the plates you take out of each pack and lay them next to the new set before you start stacking. If anything looks off, send us the year and VIN and we will check it. You can see every part we stock for this transmission on our 6L80 parts page.
Soak the new frictions in Dexron VI for at least 30 minutes before assembly. Inspect the steels as you strip each pack; this kit is built around new frictions, so steels that are blued, warped or scored need to be replaced separately rather than reused. Check every bushing in the case, pump and drums, and replace any that are scored or loose; a 6L80 bushing driver set makes that a clean job. The input shaft and drum Teflon rings must be sized after they go on, and the input shaft seal ring expander and resizer keeps them from being cut during reassembly. Set clutch clearances to the factory spec for each pack, replace the filter neck seal in the case along with the filter, and fill with Dexron VI only. Once the unit is back in, reset the transmission adapts with a scan tool and complete a relearn drive so the control module stops compensating for the old, worn clutches.
| Fits | 6L80 |
| Part type | Master Rebuild Kit |
| 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.
It is built around new friction plates, gaskets, seals and a filter. Steels are not called out in the kit contents, so inspect your old steels during teardown and replace any that are blued, warped or heat-checked.
The listing covers both the 6L80 and the 6L90. The 6L90 uses more plates in some packs, so count each pack as you take it apart and compare it to the new set before assembly. Check your RPO code: MYC is a 6L80 and MYD is a 6L90.
The 6L50 (RPO MYB) is not listed for this kit. It shares the basic design but uses different clutch counts, so match your RPO code before ordering or send us your VIN.
Dexron VI automatic transmission fluid only. Check the level at the case check plug with the fluid at operating temperature; the 6L80 has no dipstick in most applications.
Yes. Reset the transmission adaptive values and complete a relearn so the control module stops applying corrections it learned from the worn clutches. Skipping this often leaves harsh or soft shifts on a freshly rebuilt unit.
