6T30 Banner Rebuild Kit, new and ready to install. Fits the 6T30. Ships fast from the USA.
If your Chevrolet Cruze, Sonic or Aveo with the small six-speed automatic has started slipping into reverse, flaring on the 2-3 or 4-5 shift, or leaving drops of red fluid on the driveway, the transmission underneath is most likely the 6T30 (RPO MH9) or its later 6T35 update. This banner rebuild kit is built for that unit from 2009 on. It is a focused two-piece kit: one complete 6T30 overhaul gasket and seal set and one 6T30 friction clutch pack. That covers the parts that leak and the parts that slip, in one box weighing about 8 lb.
The 6T30 is the smallest member of GM's 6T30/40/45/50 front-drive family, used behind four-cylinder engines from 1.4L up. Every gear is made by applying a combination of clutch packs inside the case, each one squeezed by a hydraulic piston. When the friction material glazes or the piston seals harden, a clutch takes longer to hold, the TCM adds pressure to compensate, and eventually the shift times run past what the computer will tolerate. The overhaul set in this kit renews the gaskets, O-rings and sealing rings throughout the case, and the clutch pack replaces the worn friction plates as a matched set for the 6T30.
Be clear on what is not in the box. The listing states this kit does not include pistons, steel separator plates, a filter, bands or a pump bushing. Plan those separately, especially the 3-5-R piston, which GM recommends replacing any time this family is opened up.
Start with the fluid level, because a low 6T30 imitates clutch slip. The level is set hot at the check plug, not with a dipstick. Then read codes. On the 6T30 the generation of the controls matters: GM's PI0670A notes that the 2012 Cruze and Sonic with the 1.8L use Gen 1 controls, where the TEHCM performance test is not functional, while the 2012 Sonic 1.4L uses Gen 2. GM also warns that air-checking the 3-5-R clutch through the case is not a reliable test; the only sure check is teardown and visual inspection of the piston. If the trouble is mainly a slow engagement, our delayed engagement guide walks through the cheaper causes first, and the common problems and fixes guide lays out which failures need a rebuild.
The listing covers the 6T30 and 6T35 from 2009 forward. North American applications in its list include the Chevrolet Cruze (listed for 2009-2019 depending on engine and market), Sonic (2012-2018) and Aveo (2009-2012), along with several export models. The 6T30 shares its case design with the 6T40 and 6T45, but do not assume internal parts swap between them, so confirm the RPO code MH9 on the service parts label in the trunk or glove box, or check the transmission ID tag before ordering. If you are unsure, send us the year and VIN. You can compare other kits on the rebuild kits collection, and the 2009-2013 6T30 banner kit is an alternative if you want a different kit layout for an earlier build.
| Fits | 6T30 |
| Part type | Banner Rebuild 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.
No. It contains two items: a 6T30 overhaul gasket and seal set (without pistons) and a 6T30 friction clutch pack. Steel plates, pistons, the filter, bands and the pump bushing are not included and should be ordered separately if your teardown shows you need them.
The listing includes the Cruze 1.8L in its 6T30 application list. Confirm RPO MH9 on the service parts label before ordering. If your label shows a different transmission RPO, send us the year and VIN and we will check it.
Yes, the kit is listed for 6T30 and 6T35 transmissions from 2009 forward. Match the transmission code on your unit before installing.
DEXRON VI. The level is set with the engine running and the fluid at 85-95 C, filling until fluid just drips from the check plug.
Yes. New frictions change how quickly each clutch applies, so clear the adaptive values and run the transmission adaptive learn procedure with a scan tool, then road test through every gear.
It covers seals and frictions, but GM's bulletins tie that complaint to the 3-5-R piston and waved plate. Plan on replacing those parts as well and cleaning all debris from the case.
