4L60E Master Overhaul Rebuild Kit T05700B

This is a master overhaul kit for the GM 4L60E, built around the T05700B kit number (the T05702B overhaul set plus the T057080B and T057081B clutch groups). A master kit is what you order when the transmission is coming all the way apart: it covers the gaskets, O-rings, sealing rings and lip seals for the case, pump and valve body, plus the friction and steel packs so every clutch gets replaced instead of re-used.

The listed applications run across the GM trucks, vans and cars that used the 4L60E, including the 1995-2005 Astro and Blazer 4.3, 1995-2002 Camaro 3.8 and 5.7, 2004-2012 Colorado and Canyon (2.8, 2.9, 3.5, 3.7 and 5.3), 2007-2008 Avalanche 5.3 and 6.0, and the Trailblazer. Because GM changed the case, pump and harness details over the production run, confirm your year and engine against the application before ordering.

On the bench, lay the kit out by section before you start reassembly: pump seals and rings, input and forward clutch pistons, 3-4 and overrun packs, then the valve body and pan gaskets. Soak every friction plate in fresh ATF for at least 30 minutes before stacking, and check clutch clearances as you build each drum. A kit like this is the standard fix for a 4L60E that has slipped or burned a clutch pack, lost reverse, or is being pulled for a high-mileage overhaul.