6T40 Shift Kit 2007-2012, new and ready to install. Fits the 6T40. Ships fast from the USA.
A first-generation 6T40 that flares on the 1-2, slips the converter clutch, or keeps throwing pressure control and pressure switch codes after a fluid service usually has worn aluminum bores in the valve body. This is the new TransGo SK 6T40-A SHIFT KIT valve body repair kit for Gen 1 6T30, 6T40 and 6T45 units from 2007-2012, the ones built with pressure switches on the control solenoid body. It is the fix rebuilders reach for in early Chevrolet Cruze and other compact GM front-drivers before they condemn a valve body.
Every shift in a 6T40 is set by solenoids on the TEHCM, and those solenoids can only regulate the oil they are fed. Three valves keep that feed stable. The actuator feed limit (AFL) valve caps solenoid supply pressure no matter what line pressure does. The spring end of the pressure regulator valve receives the EPC boost signal that raises line pressure under throttle. The TCC regulator valve meters converter clutch apply. When those bores wear oval, oil bleeds off, solenoid output drifts high or low, and the TCM sees slip it cannot correct. The SK 6T40-A answers each one without machining:
Gen 1 units have two other well-known faults that look like bore wear. Units built on or before January 15, 2011 can crack the 3-5-R waved plate, which costs you reverse or third and sets P0776; no valve body kit fixes that. Pressure switch faults can also cause a flare to neutral on the 1-2 shift. Check the fluid level hot, read the codes with freeze frame, and compare commanded versus actual pressure. Our 6T40 valve body symptoms guide walks through bore wear tests, and 6T40 common problems and fixes covers the wave plate failure in detail.
This kit fits Gen 1 6T30, 6T40 and 6T45 transmissions, 2007-2012, with pressure switches. It does not fit Gen 2. GM switched to Gen 2 during 2012 with some exceptions, so a 2012 vehicle can go either way: look for the pressure switches on the solenoid body or read the eighth digit of the TEHCM part number. A Gen 2 unit needs the 6T40 Gen 2 shift kit instead. The same SK 6T40-A is listed for the 6T45 2007-2012 used behind the 2.4L. Not sure what you have? Send us the year and VIN before ordering.
| Fits | 6T40 2007-2012 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| 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 the TransGo SK 6T40-A SHIFT KIT valve body repair kit for Gen 1 6T30, 6T40 and 6T45 transmissions, 2007-2012, with pressure switches.
No. The Gen 1 kit uses a drop-in AFL bushing and valve, and the pressure regulator and TCC regulator valves are drop-in as well, so no reaming tool is needed.
Only if it is a Gen 1 unit. If the control solenoid body has pressure switches it is Gen 1 and this kit fits. If not, use the Gen 2 kit. Send us your VIN if you are unsure.
Not if the cause is a broken 3-5-R waved plate, a known failure on units built on or before January 15, 2011. That needs the plate and piston replaced. The kit targets pressure and TCC complaints from worn bores.
Dexron VI, with the level set hot. Then clear codes and run the Service Fast Learn with a scan tool so the TCM adapts to the restored pressures.
