4L70E Input Drum, new and ready to install. Fits the 4L70E. Ships fast from the USA.
Pulled the front of a 4L70E apart and found the 2-4 band burned and the drum under it blued or grooved? This is a new GM input drum, the reverse input housing, sold bare for rebuilders who already have their clutches and band and just need a clean, true housing. It suits the 4L70E in 2006-2013 Chevrolet Silverado, Tahoe and Trailblazer SS and GMC Sierra and Yukon trucks.
Parts catalogs use the words input drum for two different 4L70E parts, so start here. This listing shows a drum with a smooth outer band surface, internal splines for the clutch plates, a bushing in the hub and slotted tabs on the open end. That is the reverse input housing, the first drum behind the pump. The other part people call the input drum is the input housing with the forward, overrun and 3-4 clutches and the input shaft pressed in; we sell that as the loaded 2005-up 4L70E input drum. If your 3rd and 4th slip and the 3-4 clutches are burned, that is the one you want, not this one.
The 2-4 band wraps its outside. Apply the band and the drum stops, holding the reaction sun shell through those tabs, which produces 2nd gear and overdrive. Inside, the reverse input clutch couples the drum to the input when you select Reverse. A heavy truck pulling a trailer in overdrive keeps the band clamped on this surface for hours, so heat damage here is common in towing rigs.
The 4L70E burns bands for reasons beyond the drum: low line pressure, a worn servo pin bore and pressure control faults all show up the same way. Sonnax lists burned and overheated 2-4 bands among its 4L70E complaints, with servo and valve fixes beside them. Check pressure and codes using the 4L70E common problems guide, and if 3rd and 4th are slipping too, read the 3-4 clutch failure guide before deciding which drum is at fault.
The listing names the 4L70E without a year range. The reverse input housing is shared through the 4L60E, 4L65E and 4L70E family, but bushings and part numbers changed over the years. Lay your old drum next to the photo, count the tabs and check the bushing, or send us your year and VIN. If you want the drum identified by GM number, the GM 24245624 drum for 1987-2014 is listed with it. See the full 4L70E parts collection for everything else.
| Fits | 4L70E |
| 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.
Yes. The photo shows the reverse input housing, with the band surface on the outside and the reverse input clutch inside. The forward and 3-4 clutches live in a different input housing.
No, it is a bare new housing. Use new reverse input frictions and steels, new piston seals and a new 2-4 band.
Probably not. Slipping in 3rd and 4th with burned 3-4 clutches points to the forward and 3-4 input housing. Slipping in 2nd and 4th points to the band and this drum.
Mainly 2006-2013 Chevrolet Silverado, Tahoe and Trailblazer SS and GMC Sierra and Yukon, plus some Cadillac and Pontiac models. Send us your year and VIN to confirm.
Line pressure, the servo and pin bore, the sun shell tabs and the pump hub. A burned band usually has a cause beyond the drum.
