6T45 Master Rebuild Kit 2012, new and ready to install. Fits the 6T45. Ships fast from the USA.
Owners of a 2012 Chevrolet Equinox, GMC Terrain, Captiva Sport or other GM model with the heavy-duty 6T45 usually land here after the transmission starts slipping, loses reverse, flares on the 2-3 or 3-4 upshift, or leaves a dark, burnt film on the pan. This new master rebuild kit is built for 2012 6T45 units and supplies the frictions, steels, seals and gaskets for a complete overhaul, so the whole unit comes back together on fresh material rather than a patch on the one clutch that quit first.
The 6T45 is the heavy-duty version of the 6T40. ATRA's introduction to the family lists what GM beefed up for it: a 1.25 inch drive chain instead of the 6T40's 1 inch chain, a five-pinion input planetary, a heavier ribbed case and a heavier differential. ATRA lists the 6T45 as RPO MH7 in front-drive form and MHC with all-wheel drive. The clutch layout and TEHCM control strategy are shared with the 6T40, so the parts a master kit replaces, the frictions and steels in all five clutches and the seals and gaskets for every circuit, are the parts that wear in either unit. The extra torque the 6T45 is asked to carry is what makes clutch and seal condition so important on a 2.4L crossover that tows or spends its life loaded.
2012 is the year GM moved most of this family to Gen 2. PI0604C describes the update: no fluid pressure switches in the TEHCM, revised valve body regulators with actuator feed accumulators, one fewer 3-5-R/4-5-6 seal ring in the case, and a 4-5-6 clutch with five frictions instead of four. GM's PI0670A puts the 2012 Equinox, Terrain and Captiva Sport 2.4L on Gen 2 controls, while the Captiva Sport 3.0L stayed Gen 1. Confirm yours from the TEHCM label before you order; Sonnax gives the eighth digit under the bar code as 1, 2 or 3 for Gen 1 and B, C or D for Gen 2.
A harsh 2-3 shift on lift-off is not always mechanical. On the 2011 Equinox, Terrain and Captiva 2.4L 6T45, GM's PI0724B fixes it with a TCM calibration, so check the software level on any harsh-shift complaint first. Set the fluid level hot and run a line pressure check, since a weak pump can mimic clutch failure. If the magnet carries steel or the fluid is burnt, plan the rebuild. Our 6T40 and 6T45 common problems guide covers the diagnostic order, and the speed sensor symptoms guide helps rule out a sensor that can fake a slip code.
This kit is listed for the 6T45 in 2012 applications. Because a 2012 can be either generation and GM used the 6T40 and 6T45 across overlapping models, check the RPO code on the service parts label and match the 4-5-6 friction count and seal rings from your unit to the kit, or send us your year and VIN. A 2008-2011 unit should start with the 2008-11 6T45 master rebuild kit, and the full range is on the rebuild kit category page.
GM PI0780A calls for a new 3-5-R piston and waved plate any time the unit is disassembled, so add them to this kit, and fit new bonded pistons with the 6T40/6T45 bonded piston set rather than reusing the originals. Inspect the pump, the chain and the input planetary for wear, because those are the 6T45-specific hard parts that do not come in any master kit. Replace the converter seal and the pump filter, flush the cooler, refill with Dexron VI and set the level at 85-95 C through the check plug. Finish with the transmission adaptive learn. If the pan held a lot of debris, also plan for a new pan, filter and gasket kit and a close look at the valve body bores.
| Fits | 6T45 2012 |
| Part type | Master Rebuild 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.
Many soft parts are shared because the two units use the same architecture, but the 6T45 is the heavy-duty version with a wider chain, a five-pinion input planetary and a heavier case and differential. Match the kit to your unit's RPO code and generation rather than assuming they swap.
Check the RPO codes on the service parts identification label. ATRA lists the 6T45 as MH7 for front-wheel drive and MHC for all-wheel drive, and the 6T40 as MH8 and MHB. With the pan off, the chain width also tells them apart.
GM PI0670A lists the 2012 Equinox, Terrain and Captiva Sport 2.4L as Gen 2, and the Captiva Sport 3.0L as Gen 1. Confirm with the TEHCM label, where the eighth digit under the bar code is 1, 2 or 3 on Gen 1 and B, C or D on Gen 2.
A new 3-5-R piston and waved plate, as GM PI0780A recommends on any teardown, a set of bonded pistons, a pump filter and the revised converter seal. Inspect the drum splines, pump, chain and valve body bores before ordering hard parts.
Dexron VI. Set the final level with the engine running and fluid at 85-95 C through the check plug, then run the adaptive learn so shift timing starts from a clean baseline.
