6T50 Overhaul Kit 2008-2014, new and ready to install. Fits the 6T50. Ships fast from the USA.
This overhaul kit seals a GM 6T40, 6T45 or 6T50 six-speed front-drive automatic built for the 2008-2014 range, the unit in the four-cylinder Malibu, Equinox and Terrain, the Cruze, Sonic and Verano, and the V6 Malibu that used the 6T50. Shoppers usually find it after a stubborn leak, slow engagement in the morning, or a slip that showed up at high mileage. It carries part number S66900D with cross-reference T46002A, and it includes the paper gaskets, rubber seals, O-rings, sealing rings and snap rings for a full rebuild.
The 6T40 family uses five clutches and a one-way clutch, all applied by pistons fed through shaft sealing rings and a control valve body that bolts straight to the case. A tired seal does not fail loudly. It bleeds a little pressure, the control module stretches clutch fill times to compensate, and eventually the shift turns soft, late or harsh. This kit renews every rubber and paper seal in those circuits. It does not include pistons, frictions, steels, a filter, bushings or bearings, so it suits a unit with reusable bonded pistons. If the pistons are cracked or delaminated, add our 6T40/6T45 bonded piston set.
Check the fluid level first; a low 6T40-family unit gives the same delayed engagement as a worn seal. Then look for the leak source and check for stored codes. Our 6T40 delayed engagement guide and 6T40 fluid leak guide cover the usual suspects. Keep in mind the 3-5-reverse wave plate is a known failure in this family; if reverse and third are gone, see our wave plate failure write-up.
The kit is listed for first-generation 6T40, 6T45 and 6T50 units in the 2008-2014 range and is not for later redesigned units. GM made running changes inside this period: the Precision rebuild-kit bulletins separate 2006-2011 early units, 2012-2013 updated units, and a Gen 3 design that started in some 2014 models such as the 2014 Malibu. A 2012-2014 vehicle can fall on either side of a change, so go by the build date on the transmission tag, not just the model year, and compare the old gaskets to the new ones. Send your year and VIN if you want us to confirm. Other kits for this family are in our rebuild kits section, including the 2006-2013 overhaul kit.
| Fits | 6T50 2008-2014 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
No. It has gaskets, seals, O-rings, sealing rings and snap rings only. If a bonded piston is damaged, add a bonded piston set.
Maybe not. GM introduced a redesigned version of this family in some 2014 models, including the 2014 Malibu. Check the build date on your transmission tag or send us your VIN.
Yes. The kit is listed to cover all three first-generation versions.
DEXRON VI. Set the level hot at the check plug with the engine running.
Plan on a new filter, and inspect the frictions, steels, bonded pistons and the 3-5-reverse wave plate. Clear adaptations and run a relearn afterward.
