6L80 Banner Rebuild Kit 2007, new and ready to install. Fits the 6L80. Ships fast from the USA.
When a 2007-or-later Silverado, Sierra, Tahoe, Yukon or Escalade has a 6L80 that slips under load, bangs into reverse or has cooked its fluid, the honest repair is a full teardown with new hard parts where they wear. This kit is built for that job. Beyond the usual overhaul gaskets and seals and a friction pack, it adds a steel plate pack, a piston kit, a pump bushing and a filter, so you are not reusing heat-stressed steels or hardened pistons from a unit that already failed once.
A 6L80 makes six forward gears with five multi-plate clutches and no bands, and the TCM on the valve body times every shift by trading one clutch for another. The pistons that apply those clutches use rubber sealing lips bonded to the piston itself. After years of heat cycling those lips harden and start to bypass, so a clutch fills slowly and slips during the overlap even with fresh frictions. That is why this kit includes pistons. New steels matter for the same reason: a steel that has been overheated loses flatness, and a warped plate glazes a new friction in a few hundred miles. With frictions, steels and pistons all new, the clearances you measure on the bench are the clearances the controller will actually see.
Scan for codes, then look at the fluid and the pan before deciding. A harsh 6-4 downshift on its own may only need the adapts reset, which is GM's first correction for that complaint. No reverse after a valve body swap is often the wrong valve body for the case. A worn pump also starves every clutch at once. The 6L80 Escalade shift problems guide covers the truck and SUV cases, and 6L80 common problems and fixes lists the failures in the order shops find them.
This kit is listed for GM 6L80 and 6L80E transmissions from 2007 on. That covers the GMT900 trucks and SUVs that made the 6L80 common from 2007, and later 6L80 applications as well. It is a 6L80 kit, so do not assume it fits a 6L90 heavy-duty unit, which uses a longer case and heavier internals. Plate counts were revised in some packs during production, so count the plates in every drum on teardown and compare them with the kit before you start building. Read the RPO code on the service parts label (MYC means 6L80), or send us your year and VIN to confirm. See all our parts for this unit on the 6L80 transmission page.
| Fits | 6L80 2007 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
An overhaul gasket and seal set, a friction plate pack, a steel plate pack, a piston kit, a pump bushing and a filter. That covers the parts that wear in a normal 6L80 rebuild.
The kit is listed for 2007-and-later 6L80 and 6L80E units. If you have a 2006, send us your VIN, and on teardown compare the plate count in each drum with the kit before assembly.
It is listed for the 6L80 and 6L80E only. The 6L90 uses a longer case and heavier internals, so it needs a 6L90-specific or 6L80/6L90 combination kit.
6L80 pistons have rubber sealing lips bonded to them. Heat hardens those lips over time and they bypass pressure, so a clutch slips even with new frictions. New pistons remove that variable.
Fill with Dexron VI, set the level at the check plug with the fluid hot, then reset the transmission adapts and run the learn procedure with a scan tool.
