6T40 Overhaul Kit 2012, new and ready to install. Fits the 6T40. Ships fast from the USA.
A 2012 or newer Cruze, Malibu, Sonic, Equinox, Terrain, Regal or Verano with a 6T40 or 6T45 that slips when warm, flares between gears, or has burnt, dark fluid usually needs more than seals. This kit is built for that job. It is listed as a master-style rebuild kit for the second-generation 6T40 and 6T45, 2012 and up, and it includes the friction plates along with the gasket and seal set. Steel plates are not included, so the kit is meant for a rebuild where the steels are flat and reusable.
The 6T40 gets six forward speeds from two planetary gearsets and five clutches: 1-2-3-4, 3-5-Reverse, 4-5-6, 2-6 and low and reverse, plus a one-way clutch for first. Each clutch pack is a stack of frictions and steels squeezed by a hydraulic piston. When frictions glaze or wear thin, the pack takes longer to lock, the control module adds pressure to compensate, and eventually it runs out of adaptive range and sets a slip code. Replacing the frictions restores the pack clearance and holding capacity, and replacing the seals and gaskets at the same time makes sure the pressure actually reaches each piston.
GM switched to the Gen 2 design during 2012. Among other changes, the pressure switches were removed from the control solenoid valve assembly, and the internal parts were revised, which is why a Gen 1 kit for 2008-2011 is not the right choice for this unit.
Rule out the cheap causes first. Check the fluid hot at the level set plug, then read codes and watch commanded versus actual gear and slip with a scan tool. A failed pressure control solenoid can make a single gear go missing and look like burnt clutches, so read our 6T40 shift solenoid guide before committing to a teardown. Our 6T40 common problems guide covers the 3-5-R wave plate and cracked piston failures you should plan for once the case is open.
This kit is listed for GM second-generation 6T40 and 6T45 transmissions, 2012 and up, used in front-drive and all-wheel-drive Chevrolet, Buick and GMC models. Because GM changed over to Gen 2 partway through 2012 and some early 2012 units stayed Gen 1, match the RPO on your service parts label and compare the frictions in the kit to your old plates by tooth count and diameter before assembly. If you are unsure which generation you have, send us the year and VIN. If you only need seals and gaskets, the 6T40 overhaul kit for 2011-2018 is the lighter option, and the full list of kits is in our rebuild kits category.
| Fits | 6T40 2012 |
| 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.
It is listed as a master-style rebuild kit without steels: friction plates plus the gasket and seal set. Steel plates are not included, and pistons are not listed as included.
GM changed to Gen 2 during the 2012 model year, with some exceptions. The Gen 2 control solenoid valve body has no pressure switches. The surest way is to send us your VIN or check with your dealer by RPO.
Yes, the listing covers both Gen 2 6T40 and 6T45 units, 2012 and up. Compare plate counts to your old packs during teardown because clutch stack-ups vary by application.
On vehicles built before February 1, 2013, GM released a revised converter seal for converter housing leaks. Use the revised seal any time the transmission is out.
Dexron VI only. Fill the dry unit, run it through the ranges, then set the final level hot at the level set plug in the 85-95 C window.
