6T70 Clutch Drum 2007, new and ready to install. Fits the 6T70. Ships fast from the USA.
The 2007 model year was the first for the 6T70, and it is the year rebuilders see most often on the bench with no Reverse, no 3rd and no 5th. GM's own bulletin on that complaint lists 2007-2009 vehicles such as the GMC Acadia, and the usual find is a broken wave plate inside this drum. This is a new 6T70 clutch drum for 2007 units, complete with the input shaft, for owners and shops who would rather replace a spline-damaged housing than gamble on it.
The 6T70 has five clutches, and three of them are held stationary in the case. The other two live in this drum, which GM calls the 3-5-Reverse and 4-5-6 Clutch Housing Assembly. Because the input shaft is part of the housing, the drum spins with the converter turbine and hands that torque to the gear train whenever either clutch is applied. Apply oil comes through sealing rings at the case cover hub into two separate piston cavities. The 3-5-R clutch holds in third, fifth and Reverse; the 4-5-6 clutch takes over in fourth through sixth. The input speed sensor reads a reluctor wheel mounted on the outside of the drum, so the same part that drives the clutches also gives the TCM its input speed signal.
Read the codes and drive it gently to see which ranges are missing. Fourth, sixth and first gear working while 3rd, 5th and Reverse are gone narrows the failure to the 3-5-R circuit. Our 6T70 Acadia common problems guide covers that pattern on the crossovers that used this unit, and the 6T70 3-4 clutch failure article explains how to tell a hard-parts failure from a valve body shudder. With the unit apart, inspect the drum splines where the wave plate rides, the condition of the ring lands and the bushings. If the splines are notched or peened over, the new plate will not last in that housing.
This drum is listed for 2007 6T70 transmissions. That covers the launch-year units in GM's early front-drive crossovers, but the 6T70 and 6T75 share a family layout with different internals, and GM changed parts through later years. Confirm your unit is a 6T70 using the RPO code on the Service Parts ID label, then compare your old drum with the photo for shaft length, spline count and reluctor wheel position. Send us your year and VIN if you want a fitment check before it ships. Later-year and 6T75 drums, plus all other parts for this family, are on our 6T70 collection page.
| Fits | 6T70 2007 |
| Part type | Clutch Drum |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
GM's wave plate bulletin lists 2007-2009 models including the GMC Acadia with 6T70/6T75 transmissions. Because 6T70 and 6T75 units both appeared in this period, check the RPO code on your Service Parts ID label to confirm which one you have.
Yes. The input shaft is part of this housing assembly on the 6T70, and it is shown installed in the product photo.
Those three gears all use the 3-5-Reverse clutch in this drum. The common cause on early units is a broken wave plate, which GM addressed with service bulletins and special coverage, and the broken plate often damages the drum splines.
Only if the splines, ring lands and bushings are clean and undamaged. A housing with notched splines tends to break the next plate, which is why many rebuilders replace the drum along with the plate.
Dexron VI automatic transmission fluid. GM's owner manuals for 6T70 vehicles specify Dexron VI and checking the level at operating temperature.
