6L80 Input Drum, used and ready to install. Fits the 6L80. Ships fast from the USA.
A 6L80 that pulls fine through third and then slips, flares or neutralizes going into fourth, fifth or sixth often has a problem at the back of the gear train, where the 4-5-6 clutch lives. This listing is a used GM 6L80 input drum: the 4-5-6 clutch housing with its input shaft, shown in our photo as one piece and listed with GM reference 24237556. It fits the 6L80 in 2006-2020 Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Camaro and Corvette applications, and it is for the rebuilder who has found a worn, cracked or twisted housing and wants an original GM part rather than a reworked one.
The input shaft is splined to the torque converter turbine, so it always turns at turbine speed. On the 6L80 that shaft is built into the 4-5-6 clutch housing. The slotted shell holds the steel plates, and when the valve body applies the 4-5-6 piston, the pack ties turbine speed into the rear gearset for fourth, fifth and sixth gears. The front clutches, 1-2-3-4 and 3-5-Reverse, share a separate housing up behind the pump, which is why a buyer chasing a no-reverse complaint usually needs that drum instead. Because the input speed sensor reads turbine speed that this assembly carries, a damaged or wobbling housing can upset the ratio math the TCM uses for every shift.
Scan codes and check line pressure first. A sticking clutch regulator valve or a failed TEHCM can produce the same upper-gear slip with nothing wrong mechanically; our 6L80 common problems guide covers those first. With the unit apart, air-check the 4-5-6 piston, look for heat bluing on the housing, measure the shaft sealing ring lands and inspect the splines. If your complaint is no reverse or a slipping third and fifth instead, read the 3-5-R clutch failure guide, because that points to the front housing, not this one.
This drum is listed for the 6L80 with no specific year, and parts catalogs show 24237556 serving 2006 and later GM applications. GM made running changes through the 6L80 run, including a different input shaft tip on later CPA-equipped trucks, and the 6L90 uses heavier internals, so compare shaft length, spline count, the sealing ring grooves and any casting numbers with your old part before you order, or send us your year and VIN and we will confirm it. For 2006 units we also list the 2006 6L80 input drum, and every GM six-speed part we stock is in the 6L80 collection.
| Fits | 6L80 |
| Part type | Input Drum |
| Condition | Used |
| Brand | OEM |
| Reference | 24237556 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. This is the 4-5-6 clutch housing with the input shaft. The 1-2-3-4 and 3-5-Reverse clutches use a separate housing at the front of the case, which is the usual suspect for no-reverse complaints.
Fourth, fifth and sixth, since the 4-5-6 clutch is applied in all three. Slipping or flaring on the 3-4 shift with good lower gears is the classic sign.
It is listed for the 6L80 without a model year. Compare shaft length, splines and sealing ring grooves with your old part, or send us your year and VIN and we will check fitment.
No. It is a used housing and shaft. Plan on new 4-5-6 frictions, steels, piston seals and shaft sealing rings during the rebuild.
Inspect or replace the 4-5-6 clutch hub, install a rebuild kit with fresh clutches and seals, a new filter, and DEXRON VI, then run the TCM relearn.
