6T40 Overhaul Kit 2011-2018, new and ready to install. Fits the 6T40. Ships fast from the USA.
A Malibu, Equinox, Terrain, Cruze, LaCrosse or Regal with the 6T40 or 6T45 that leaks, flares between gears or slips once it is hot is usually a teardown waiting to happen, and this is the sealing set for that teardown. The kit is new and contains O-rings, metal clad seals, oil sealing rings, gaskets and the valve body paper gasket for an internal overhaul of the 6T40 and 6T45. It is listed for 2011-2018. It is a reseal kit only, so it does not replace frictions, steels or the bonded pistons.
The 6T40 and 6T45 share a case and clutch layout: the low and reverse, 1-2-3-4, 2-6, 3-5-R and 4-5-6 clutches are fed from the valve body through the case and the clutch housings. Metal clad seals keep fluid in at the converter and axle openings, the oil sealing rings pass pressure across rotating parts into the 3-5-R and 4-5-6 housings, and the O-rings and gaskets close the passages in between. The valve body paper gasket matters more than it looks: if it is torn or compressed unevenly, solenoid-controlled pressure can cross between circuits and set codes that look like a bad solenoid.
Check the level hot at the case plug near the axle seal; GEARS notes that even half a quart over can push fluid out the vent and look like a leak. Rule out solenoid and module faults with our 6T40 shift solenoid guide, since GM's own bulletins show a non-working pressure control solenoid can cause missing gears. For slipping third, fifth or reverse, GM's PI0670A sends technicians to the 3-5-R piston for cut sealing lips and warns against relying on a case air check. If the teardown confirms internal leakage, the reseal is the core of the repair. The known failures for this family are collected in our 6T40 common problems guide.
This kit is listed for 6T40 and 6T45 transmissions from 2011-2018. The application list that comes with it leans toward earlier cars: 2008-2011 Malibu, 2009-2011 Equinox and Terrain, early Cruze, LaCrosse and Regal, 2008-2009 Pontiac G6, 2009-2011 Saturn Aura and 2010-2011 Vue, plus the Verano. That matters because GM's PI0604C describes a 2012 Gen 2 update that removed one 3-5-R and 4-5-6 seal ring from the case and revised and relocated the 4-5-6 piston outer seal, with some 2012 cars staying on Gen 1. Before you order for a 2012 or later vehicle, send us the year and VIN so we can check your case generation against this kit and the 6T40 overhaul kit for 2012. Compare master kits and other reseal sets in our rebuild kits collection.
| Fits | 6T40 2011-2018 |
| 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.
Yes, it is listed for both. They share the case and clutch layout. Send us your year and VIN if you are unsure which one you have.
O-rings, metal clad seals, oil sealing rings, gaskets and the valve body paper gasket. Frictions, steels, bonded pistons and the filter are not included.
The listing covers through 2018, but the application list with the kit is weighted toward 2008-2011 Gen 1 cars. Gen 2 cases from 2012 changed the seal rings and the 4-5-6 piston outer seal, so send the VIN and we will confirm before you buy.
GM lists a 4.0-6.0 L fluid change capacity for the 6T40 with DEXRON VI. A dry unit after an overhaul takes more, so fill and then set the final level hot at the check plug.
Yes. Run the adaptive learn with a scan tool after the rebuild so the control module learns the new clutch fill times; expect shift feel to settle once it completes.
