4L80E Overhaul Kit 2005, new and ready to install. Fits the 4L80E. Ships fast from the USA.
When a 2005 or later 4L80E is slipping, burning fluid or leaking at every seal, a piece-by-piece repair rarely holds. This is a new master overhaul kit for the 2005-up 4L80E and 4L85E, the late units in Chevy and GMC 2500 and 3500 pickups, Suburban 2500, Express and Savana vans and the Hummer H1. It is the box a rebuilder wants on the bench: BorgWarner friction clutches, steel plates, a full gasket and seal set, molded rubber pistons, a new filter, front and rear bushings, and both the front and rear bands.
The 4L80E holds its gears with clutch packs, one-way clutches and two bands. Every clutch pack depends on a piston seal, sealing rings and a set of frictions and steels, and every circuit depends on gaskets that keep line pressure where it belongs. A soft parts kit alone only reseals the unit. This kit adds the wear items too: new clutches and steels for the packs and both bands, so the overrun, forward, direct and fourth clutches all go back with fresh plates, and the front and rear bands are not reused after years of heat. Many lower-priced kits leave out the steels and the bands, which forces a second order mid-rebuild.
Make sure the problem is internal wear and not a solenoid, sensor or wiring fault. Read codes, check fluid level hot, and gauge line pressure. Our pressure control solenoid guide covers the EPC faults that mimic clutch slip, and the speed sensor guide covers the input and output sensor failures that throw false slip codes. If pressure is good and the slip remains, the unit needs this overhaul.
This kit is built for the 2005 and later 4L80E and also fits the 4L85E. That covers the late-production trucks and vans through the end of 4L80E use. Earlier 1991 to 2004 transmissions differ in places, so check the year on your unit before ordering, or look at the earlier kits we carry. If you are working on a swap or a transmission with an unknown history, send us the year and VIN or the ID tag and we will confirm. The rest of our 4L80E parts are on the 4L80E collection page.
| Fits | 4L80E 2005 |
| Part type | Overhaul 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.
Yes. It includes BorgWarner friction clutches, steel plates, and both the front and rear bands, along with the seals and gaskets.
Yes, it is listed for the 2005 and later 4L80E and 4L85E.
Yes, the kit comes with a new filter plus front and rear bushings and a molded rubber piston kit.
Usually only hard parts that fail inspection, such as a damaged drum, sun gear, pump or one-way clutch, plus fresh fluid. Some builders also replace the solenoids while the valve body is out.
Clear the transmission adaptive values with a scan tool, then drive the truck through normal shifts so the computer learns the new clutches.
Dexron VI ATF. Check the level with the transmission hot.
