6T70 Input Drum 2011, used and ready to install. Fits the 6T70. Ships fast from the USA.
Rebuilders call it the input drum because it is the first thing the converter turns. In a 2011 6T70, the input shaft and the clutch housing that rides on it are one assembly, and when the shaft splines, sealing ring lands or the drum itself are worn out, nothing downstream can be fixed with soft parts alone. This used GM input drum from a 2011 unit is for owners and shops working on a 6T70 with lost gears, a flare between shifts or a repeat failure after an overhaul.
The input shaft is splined to the torque converter turbine, so this drum spins at turbine speed whenever the engine is running in gear. Inside the housing sit two clutch packs, 3-5-Reverse and 4-5-6, which connect input torque to the gear train in five of the seven ranges. Their apply oil comes in through sealing rings riding on the case cover hub, then through drillings in the housing to two separate pistons. On the outside of the drum is the input shaft speed sensor reluctor wheel, held by a retaining ring. The TCM uses that signal to calculate slip and to learn clutch fill times, which is why a damaged reluctor or a drum running out of true can upset shift quality as well as set speed sensor codes.
Scan for codes and road test to find which ranges are affected. ATRA suggests unplugging the transmission: if reverse returns in failsafe, the problem is electrical, not the drum. If the unit is already apart, spin the shaft and look at the ring lands, the turbine splines, the reluctor wheel and the spline teeth that carry the 3-5-R waved plate. For the full model rundown, read our 6T70 common problems and fixes, and for crossover-specific symptoms the Acadia shift problems guide covers the drive-learn and shudder bulletins that are often mistaken for hard-part failures.
Listed for 2011 6T70 transmissions. A 2011 build falls after the 2010 cutoff ATRA uses for the updated waved plate and before GM's 2013 Gen 2 control update, so it matches other Gen 1 later-production units. Because the 6T70 and 6T75 are both used across GM's front-drive lineup, read the RPO code on your vehicle's label, match shaft length and spline count to your old part, or send us the year and VIN to confirm. Browse the rest of our 6T70 parts to complete the job.
| Fits | 6T70 2011 |
| Part type | Input Drum |
| Condition | Used |
| 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.
On this transmission, yes in practice. GM calls it the 3-5-Reverse and 4-5-6 Clutch Housing Assembly, and it rides on the input shaft, so shops use both names for the same assembly.
It can. The input speed sensor reads a reluctor wheel mounted on this drum, and ATRA lists P0716 and P0717 among the codes that can set when the 3-5-R waved plate breaks. Check the sensor and wiring as well before blaming the drum.
Do not assume it will. 2013 brought the Gen 2 controls update on some RPOs, and internal parts changed over the years. Send us your year and VIN and we will confirm.
New sealing rings, piston seals, frictions, steels and an updated waved plate at minimum. If debris went through the unit, inspect the planetary and the case cover hub too.
Yes. Clear the codes and complete the shift adapt drive cycle so the TCM relearns clutch fill volumes for the rebuilt packs.
