6T30 Overhaul Kit 2010, new and ready to install. Fits the 6T30. Ships fast from the USA.
A 6T30 that leaks at the converter housing, engages late on a cold morning, or slips once it is warm has usually reached the point where a reseal is not enough and the bonded pistons need replacing too. This 6T30 overhaul kit is listed for 2010-up units and includes the pistons along with the gasket and seal set, so the parts that harden and crack with heat are all replaced in one teardown.
The 6T30 is a hydraulically applied six-speed: every clutch is squeezed by a piston fed through passages that are sealed by lip seals, sealing rings, O-rings and gaskets. As those parts age, pressure bleeds off between the valve body and the clutch it is trying to apply, and the transmission control module sees slip. Many pistons in this family are bonded, meaning the rubber seal is molded to the metal piston and cannot be replaced on its own. When the bonding cracks or the rubber shrinks, the whole piston has to go, which is why a kit with pistons matters here.
ATRA's GEARS writers documented a 6T40/45 that set P2723 because a bonded apply piston had cracked, and they advise replacing those pistons on every rebuild. The 6T30 shares the family design.
If the only problem is an external leak, find the source first; our 6T40 family fluid leak guide lists the usual spots, and an overfill can push fluid out of the vent. GM's bulletin PI0950 also says not to pull the transmission just for a converter seal unless it is leaking or internal repairs are needed. If you have slipping, missing gears or codes, check level and condition, scan for codes and test the solenoids so you do not tear down a unit whose fault is electrical. The 6T40 common problems guide covers that sequence.
The kit is listed for 6T30 transmissions from 2010 on. The 6T30 shares its layout with the 6T40 and 6T45 but not every part, so confirm you actually have a 6T30 from the RPO codes on the service parts label before ordering. GM revised seals and controls during the run, including the 2012 Gen 2 controls, so compare the gaskets and pistons to your old parts as you disassemble, and send us your year and VIN if anything does not match. Year-specific options include the 6T30 overhaul kit for 2011-2013, and master and banner kits for this family are in the rebuild kits section.
Soak new lip seals and pistons in clean Dexron VI before assembly, lubricate sealing rings with assembly gel, and size them before installing drums. Do not reuse any bonded piston. A pump seal installer set keeps the front seals square, and GM's revised converter seal, 24256953, is the one to use any time the unit is out on 6T30-family vehicles built before February 1, 2013. This kit does not include frictions, steels or a filter, so buy those for a full rebuild, and replace the 3-5-R waved plate. If the valve body solenoids are tired, the 6T30 solenoid kit can go in during the same job. Air check every clutch on the bench, fill with Dexron VI, set the level hot at the level set plug, then clear adapts and drive through a relearn.
| Fits | 6T30 2010 |
| 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.
Gaskets, lip seals, O-rings and sealing parts plus the bonded clutch pistons. Frictions, steels, the filter and hard parts are not included.
It is listed for 2010-up 6T30 units. Confirm the 6T30 RPO on your service parts label and compare the pistons to your old ones, or send us your year and VIN.
Many 6T30-family pistons have the seal bonded to the metal, so the seal cannot be replaced separately. Cracked or heat-shrunk pistons cause slipping and pressure codes, so they should be replaced on every rebuild.
Check the seal in your kit against GM's revised converter seal 24256953. GM recommends the revised seal any time the transmission is removed on vehicles built before February 1, 2013.
Dexron VI. After the rebuild, set the level hot at the level set plug, clear the adaptive values and complete a relearn drive.
