6T70 Input Drum, remanufactured and ready to install. Fits the 6T70. Ships fast from the USA.
The input drum is the first thing turning behind the torque converter in a 6T70, and when it wears out the complaints range from a flare between gears to no Reverse at all. This remanufactured GM 6T70 input drum is pictured built up, with the input shaft, housing and clutch packs together as one assembly. It is aimed at the person with a 6T70 out of an Impala, Malibu, Traverse, Acadia or Equinox on the bench, looking at a drum with worn ring lands, a damaged spline or a reluctor ring that took a hit from debris.
Think of the input drum as three jobs on one shaft. At the front, the shaft spline engages the converter turbine and carries every bit of engine torque into the gearbox. In the middle, machined lands carry the sealing rings that route apply oil from the stationary hub into the drum. At the back, the housing holds the 3-5-Reverse and 4-5-6 clutches and their pistons. GM's service description shows the 3-5-R clutch applied in 3rd while the 2-6 clutch releases, and the 4-5-6 clutch taking over in 4th. On the outside of the housing is the toothed ring the input speed sensor reads, which the TCM uses to calculate slip and time each shift. Wear in any one of those areas shows up as a drivability problem.
Rule out the cheaper causes first. Harsh or inconsistent shifts with all gears present are often adapt or valve body issues, and our 6T70 Impala shift problems guide covers how to sort those out with a scan tool before anything comes apart. For the hard-failure pattern of missing gears, the 6T70 common problems and fixes guide lays out the wave plate failure. With the drum in hand, air check each piston circuit, look at the ring lands for steps or scoring, check the turbine spline for twisted teeth and confirm the reluctor ring is tight and straight. Sonnax notes the drum splines are usually damaged when the wave plate fails, so a drum from a P0776 unit deserves a close look before it is reused.
Listed for the 6T70 with no specific year range. The family runs from 2007 into the late 2010s, GM brought in a Generation 2 update for 2013, and the 6T75 uses its own drum. Confirm your unit on the RPO code label, then put the old drum beside this one and match the shaft length, the turbine and clutch splines, the ring groove count and the reluctor ring before installation. Send us the year and VIN if you want us to check it first. Year-specific versions, including the 6T70 input drum 2007-13, and all other parts for this family are on the 6T70 parts collection.
| Fits | 6T70 |
| Part type | Input Drum |
| Condition | Remanufactured |
| 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 pictured as an assembled unit with the input shaft, the housing and the clutch packs installed. Compare the photo with your old drum and plan on new sealing rings at installation.
It can, through worn ring lands that leak apply pressure, but adapt and valve body problems cause the same feel far more often. Check scan data and do an adapt reset and relearn before replacing hard parts.
No. This listing is for the 6T70. The 6T75 has its own drum; check the RPO code on the Service Parts ID label to see which transmission you have.
The listing does not give a year range. GM updated the 6T70 to Generation 2 for 2013, so match splines, ring grooves and the reluctor ring to your old drum, or send us your year and VIN.
Dexron VI, checked at operating temperature. Then reset the transmission adapts and complete the drive learn so the TCM relearns clutch fill on the new drum.
