Master rebuild kit for the GM 6T30 six-speed automatic in the Chevy Cruze 1.8L, Aveo 1.6L and Trax, with the parts to overhaul every clutch pack.
This is the overhaul kit for the small GM six-speed, the 6T30, as fitted behind the 1.8L in a 2010-2014 Chevrolet Cruze, the 1.6L Aveo and the 1.4L and 1.8L Trax. Owners usually find it after the car starts flaring between gears, slipping when it is warm, losing reverse, or leaving dark, burnt fluid on the dipstick plug. The kit, supplier part number BL-10035227, carries the friction plates and steel plates for the clutch packs plus the gaskets, seals and o-rings to reseal the case, so the whole unit goes back together on new wear material instead of a patch on one clutch.
The 6T30 is the lightest member of GM's front-drive six-speed family and shares its basic clutch layout and TEHCM control strategy with the 6T40 and 6T45. It is paired with small engines, which sounds easy on it, but the packs are also smaller, so a low fluid level or a pack that has started to slip heats the plates fast. Once a lining glazes, the TCM keeps adding pressure and time to each shift and the slip spreads. The photos for this kit show the full spread: frictions and steels for each pack, the case and pan gaskets, the stacked valve body gaskets, the converter and axle lip seals, piston and drum seals, o-rings and check balls. That covers both halves of the problem, the wear surfaces and the seals that hold apply pressure.
A small six-speed run low will slip all on its own, so start by checking the level hot at the check plug. Then read codes and look at the pan. Clean fluid with a solenoid or TEHCM code is usually a controls job, and the 6T30 solenoid kit for 2010-2012 may be all it needs. Burnt fluid, debris and slip in more than one gear mean worn packs. GM's P0776 bulletin has the technician check the 3-5-R clutch before condemning the TEHCM. If your complaint is a lazy shift into gear rather than a slip, read our delayed engagement guide for the family first.
The fitment chart for this kit lists the 2010-2014 Cruze 1.8L, the 2014 Cruze 2.0L, the 2009-2014 Aveo 1.6L, the 2013-2014 Trax 1.4L and the 2013 Trax 1.8L, with OE references B210820A, B210880A and W210881A. Treat the 2.0L and Aveo lines with care: GM fitted different automatics to those nameplates depending on market and year, and many 1.4L turbo cars carry the 6T40 instead. GM's Gen 2 update in 2012-2013 also revised the 4-5-6 clutch across the family. Read the transmission ID tag, compare your old plate stack and gaskets with the kit, or send us your year and VIN. A second 6T30 option is the 6T30/6T30E kit for the Cruze, Sonic and Encore, and the 6T40 and 6T45 kits are on the rebuild kit category page.
Soak every friction in Dexron VI before stacking it, and check each pack clearance as you build it. The return spring packs have to be compressed to get the snap rings in and out; the DT-47799 clutch piston spring compressor set fits this family and keeps the pistons from cocking in the bore. Inspect the 3-5-R wave plate and the drum splines while the unit is apart, because that plate is not in this kit and is a known failure point. Lube the new seals with assembly gel, and fit the new converter seal; GM revised that seal for family units built before February 2013. If you want firmer shifts and longer clutch life, the 6T30 shift kit goes in during the same job. Fill with Dexron VI, set the level hot and run the TCM adaptive learn before the test drive.
| Transmission | GM 6T30 / 6T30E 6-speed automatic |
| Fits | 2010-2014 Chevy Cruze 1.8L/2.0L, Aveo 1.6L, 2013-2014 Trax 1.4L/1.8L |
| Includes | Friction and steel plates, overhaul seals and gaskets (as pictured) |
| Part number | BL-10035227 |
| Weight | 6.6 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listed fitment is the 2010-2014 Cruze 1.8L, 2014 Cruze 2.0L, 2009-2014 Aveo 1.6L, 2013-2014 Trax 1.4L and 2013 Trax 1.8L. Check the transmission ID tag first, because some of those models also came with a 6T40, 6T45 or another automatic.
The photos show friction plates, steel plates, the pan and case gaskets, the valve body gasket set, lip seals, piston and drum seals, o-rings and check balls. The torque converter, solenoids, bushings and the 3-5-R wave plate are not included.
They are the OE kit references the kit is matched to. Compare them with your rebuild records or your old parts, or send us your year and VIN and we will confirm.
Yes. Run the transmission adaptive learn after the overhaul. A rebuilt 6T30 that has not relearned often shifts harsh or late until the TCM adapts to the new clutches.
Dexron VI. Soak the new frictions in it before assembly, then fill and set the final level with the fluid hot through the check plug.
