6T75 Input Drum 2007-13, new and ready to install. Fits the 6T75. Ships fast from the USA.
A 6T75 that moves off the line fine but flares into neutral on the upshifts, or one that has dropped reverse entirely, is often telling you something about the front of the gear train. This new GM 6T75 input drum for 2007-13 is the input shaft and the clutch housing that rides on it, the assembly behind every gear from 3rd up plus reverse. Buyers usually land here after a teardown shows the housing, its splines or its seal surfaces are past saving.
The shaft is splined to the converter turbine, so it spins whenever the engine drives the transmission. On its end sits a single housing with two pistons: one applies the 3-5 reverse clutch, the other applies the 4-5-6 clutch. Pressure control solenoids in the valve body send fluid down passages in the case, across the shaft's sealing rings and into the correct piston cavity. GM's service description shows the 3-5-R pack applying for 3rd and the 4-5-6 pack taking over on the 3-4 upshift, with both working together in 5th. That makes the sealing rings and ring lands as important as the clutch splines; if fluid leaks past them, the piston never sees full apply pressure and the pack slips no matter how new the frictions are.
Separate electrical and hydraulic causes first. Scan for codes and look at the commanded versus actual gear ratio data; a slip that follows one clutch across several gears points at that pack. GM's fault-diagnosis tables for this transmission list wave plates and splines among the causes of harsh engagement, and the waved plate failure is well documented for early units. With the unit apart, air-check the housing: blow regulated air into each apply passage and listen for leaks at the rings, piston seals and housing. Then inspect the ring lands on the shaft for steps or wear, the spline teeth for damage, and the bushing surfaces for scoring. If you see harsh 1-2 shifts with no codes instead, that is an adapt problem rather than this drum, and our 6T70 Acadia shift problems guide covers the drive learn fix. For flare on the 3-4 shift, the 6T70 3-4 clutch failure guide is the place to start.
This drum is listed for 6T75 transmissions from 2007 to 2013. GM's 2013 Generation 2 changes mean that the newest year in the range deserves a careful comparison, so match shaft length, spline count, ring groove layout and the housing casting to the part you remove, or send us your year and VIN and we will check it. The 6T75 and 6T70 look alike from the outside; if your RPO code says 6T70, the 6T70 input drum 2007-13 is the right page. All parts for both units are on the 6T70/6T75 collection.
| Fits | 6T75 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.
Third, fourth, fifth, sixth and reverse. First and second do not use the clutches in this housing, so a vehicle with a failed drum often still pulls away normally.
Yes. It is the input shaft and the 3-5 reverse/4-5-6 clutch housing as one assembly. Clutches, pistons, seals and the waved plate are separate.
Buy the one that matches your unit. Check your RPO code or send us your VIN and we will tell you which listing fits.
Air-check the housing once the unit is apart and inspect the splines and ring lands. Shudder or harsh shifts with clean clutches usually point to the valve body or adapts instead.
DEXRON-VI, level checked at operating temperature, then clear adaptive values and complete a drive learn with a scan tool.
