6T30 Overhaul Kit 2013-2018, new and ready to install. Fits the 6T30. Ships fast from the USA.
This is the reseal kit for a later 6T30, the 2013-2018 units found in small GM cars and crossovers such as the Cruze, Sonic, Trax and Encore, depending on engine. Owners usually land here after a slow, soft engagement on cold mornings, a slip that shows up once the car is hot, or a leak that has already forced a top-off or two. It is a new set of gaskets, seals, O-rings, sealing rings and small rubber parts for a complete internal overhaul. Clutch packs and bonded pistons are not part of it.
Every gear in the 6T30 is the result of two clutches holding at once, and each clutch is applied by fluid pressure from the valve body acting on a piston. Between the valve body and that piston the fluid passes through the case, across rotating seal rings and past lip seals, so the reseal is literally what decides how much of the commanded pressure arrives. On the Gen 2 units this kit is listed for, GM changed the sealing layout compared with the first design, which is why a later case needs its own set rather than an early one.
Do the cheap checks first. Set the fluid level hot at the check plug and look at its condition; a lot of soft-engagement complaints on this family are a level or valve body problem, not seals. Our 6T40 family delayed engagement guide explains how to separate the two, and the valve body symptoms guide covers the solenoid and bore wear that mimics a leak. A pressure leak inside the unit is only proven on the bench: GM's PI0670A says to inspect the 3-5-R piston for cut lips and not to trust an air check through the case. Once you are tearing it down anyway, a full reseal is the right call.
The kit is listed for 6T30 transmissions built for 2013-2018. GM's PI0604C states that all 2013 vehicles it covers use the Gen 2 design, with one fewer 3-5-R and 4-5-6 seal ring in the case and a revised, relocated 4-5-6 piston outer seal. For a 2011 or 2012 build, look at our 6T30 overhaul kit for 2011-2013 instead, and for the latest years compare the 2016-2019 kit. Because these overlap at the edges, send us your year and VIN and we will match the kit to your unit. Other seal and clutch sets are listed in the rebuild kits section.
| Fits | 6T30 2013-2018 |
| 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 for 2013-2018 6T30 units, which covers that year. The Cruze used more than one transmission depending on engine, so send us your VIN and we will confirm it is a 6T30 and that this kit matches.
No. GM's PI0604C shows the later Gen 2 design removed a case seal ring and revised and relocated the 4-5-6 piston outer seal, so an early kit will not seal a later case correctly.
Plan on bonded pistons, a filter and any frictions or steels the teardown shows are worn. If a clutch housing is damaged, a clutch module or drum is the other common add.
Only if the delay comes from internal leakage. Check level, fluid condition and the valve body first; a full reseal makes sense once the unit is coming apart for confirmed internal wear.
DEXRON VI. Run the engine in park, cycle the ranges, then check at the level plug with fluid between 85 and 95 C, letting it drip until it stops.
