6T70 Input Drum 2007-13, new and ready to install. Fits the 6T70. Ships fast from the USA.
If your Traverse, Acadia, Enclave, Equinox, Malibu or Impala with the six-speed 6T70 suddenly lost reverse, 3rd and 5th, or the rebuilder who opened it called you about chewed-up drum splines, this is the part that conversation ends with. This is a new GM 6T70 input drum for 2007-13 units: the input shaft with the 3-5 reverse and 4-5-6 clutch housing mounted on it, supplied as one assembly. It is the piece a rebuild cannot reuse once a broken wave plate has torn into it.
Engine torque comes off the converter turbine into this shaft, and the drum on its end is where two of the five clutches live. GM's own service description calls it the 3-5 reverse/4-5-6 clutch housing. When the TCM commands third gear, the 35R pressure control solenoid sends fluid into this housing to stroke the piston and clamp the 3-5-R plates. On the 3-4 shift the 3-5-R pack releases and the 4-5-6 pack, also inside this drum, applies. Put together, the drum carries power in 3rd, 4th, 5th, 6th and reverse. Only 1st and 2nd get by without it, which is why a failed housing usually leaves you with a vehicle that launches but will not climb past second or back up.
Start with codes and a pan drop. GM bulletin 09-07-30-012F ties the no reverse, 3rd or 5th complaint with P0776 directly to a broken 3-5-R waved plate in 2007-2009 units, and the early units are where this failure clusters. Sonnax notes that when that plate breaks it usually damages the drum splines, and that is the point where a new housing becomes the repair instead of a plate swap. Once the unit is apart, inspect the spline teeth that hold the steel plates, the piston bore and the sealing ring surfaces on the shaft. Our 6T70 3-4 clutch failure guide walks through which pack does what on each shift, so you can match a slip to the right clutch before you spend money. If your symptoms are shudder or harsh shifts without lost gears, read 6T70 common problems and fixes first, because valve body and solenoid faults can mimic clutch trouble.
This listing covers the 6T70 for 2007 through 2013. That span crosses GM's 2013 Generation 2 update, so a late 2013 unit may not be the same as a 2008. Before you order, compare the shaft length, spline count and housing casting against the part coming out, or send us your year and VIN and we will confirm. If your RPO code shows a 6T75 rather than a 6T70, use the 6T75 input drum 2007-13 listing instead. Every other 6T70 part we carry is on the 6T70 transmission page.
A magnetic drain plug is cheap insurance afterward: it holds fine steel in the pan and gives you an early look at wear at the next service.
| Fits | 6T70 2007-13 |
| Part type | Input Drum |
| 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 the input shaft with the 3-5 reverse and 4-5-6 clutch housing attached, as one assembly. Clutch plates, pistons and seals are not included.
That pattern with P0776 usually means a broken 3-5-R waved plate. If the broken plate damaged the housing splines, yes. If the splines are clean, a new plate and clutches may be enough.
2013 is the year GM introduced Generation 2 updates. Match the shaft and housing to your old part, or send us your year and VIN before ordering.
DEXRON-VI only. Check the level hot at the check plug or dipstick per your vehicle, then clear adaptive values and do a drive learn.
An updated 3-5-R waved plate, the frictions and steels for both packs, piston seals, the shaft sealing rings, and the filter. Flush the cooler too.
