6L80 Overhaul Kit, new and ready to install. Fits the 6L80. Ships fast from the USA.
When a GM 6L80 six-speed comes out of a Silverado, Sierra, Tahoe, Yukon, Escalade, Camaro or Corvette for a rebuild, the soft parts are what go back in first. This 6L80 overhaul kit is the gasket and seal set for that job: gaskets, seals and O-rings, made in the United States. It is the right buy if your unit is leaking, losing apply pressure after high mileage, or slow to engage when cold, and you are already planning to open the case.
The 6L80 is a clutch-to-clutch automatic with five clutches and no bands. The TCM shifts it by filling one clutch while it exhausts another, so every piston has to hold pressure the instant it is commanded. The lip seals on those pistons, the sealing rings that carry oil from the pump cover into the spinning 1-2-3-4 and 3-5-R housing, the case and valve body gaskets and the O-rings at the pump and fittings all decide whether that oil arrives on time. When they harden or wear, the clutch fills late, slips for a moment, and the shift flares or bangs.
This kit is the sealing half of a rebuild only. It does not include friction plates, steel plates, pistons or a filter, so price those separately if your clutches are burnt.
Seals are only one cause of those complaints. A cracked 1-2-3-4 / 3-5-R housing weld, a sticking clutch regulator valve, or a TEHCM fault can all look the same from the driver's seat. Check fluid level hot at the check plug, read codes and pressure with a scan tool, and work through the 6L80 common problems guide before you commit to a teardown. If the complaint is no reverse, the 6L80/6L90 3-5-R clutch failure guide covers the housing air check.
This kit is listed for the GM 6L80 (RPO MYC) with no single year range, which covers the 2006-on cars and the 2007-on trucks and SUVs. The 6L80 changed during production, and the change that matters most for a seal kit is the pump cover: GM built 2006 through early 2009 units with one-piece 1-2-3-4 and 3-5-R seal rings, then switched to a notched two-piece design in December 2008. One-piece rings must not go on a two-piece cover. Compare the rings in the kit to your pump cover, and if you are unsure, send us your year and VIN before you start. It is not listed for the 6L90. Everything else for the unit is in the 6L80 parts collection.
| Fits | 6L80 |
| Part type | Overhaul 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.
Gaskets, seals and O-rings for the 6L80. It does not include friction plates, steel plates, pistons or a filter. If your clutches are worn, add a master rebuild kit or friction set.
It is listed for the GM 6L80 (RPO MYC), used in Silverado, Sierra, Tahoe, Yukon, Escalade, Camaro and Corvette applications. Check the RPO on your service parts label, and send us your year and VIN if you want us to confirm.
GM used one-piece rings on 2006 through early 2009 units and switched to two-piece rings in December 2008. Two-piece covers have a notch in the ring grooves. Never put one-piece rings on a two-piece cover.
Only if the cause is a leaking seal or sealing ring. A cracked 1-2-3-4 / 3-5-R housing weld has to be replaced, and a sticking 3-5-R regulator valve needs valve body work. Air check the housing first.
DEXRON VI. The 6L80 has no dipstick on most vehicles, so set level hot at the check plug. Reset transmission adapts with a scan tool and drive it through the relearn.
