722.6 Input Drum 2000-2006, used and ready to install. Fits the 722.6. Ships fast from the USA.
This used original-equipment input drum fits the Mercedes 722.6 five-speed automatic in 2000 to 2006 vehicles, the years that cover W203 C-Class, W210 and W211 E-Class, W220 S-Class and W163 ML models. On the 722.6 the input drum is the K2 clutch drum, and it is a single assembly with the input shaft and the front internal ring gear, so when the drum, its bushing or the shaft splines are damaged you replace the whole piece. Buyers usually reach this part after a slip in third, fourth or fifth gear, a flare on the 2-3 shift, a whine from a planetary that lost its pilot, or an n2 speed sensor fault after internal damage.
Unlike most automatics, the 722.6 does not need to apply a forward clutch to move off in first. The torque converter turbine turns the input shaft, and because the front ring gear is part of the K2 drum, engine power is already in the front planetary before any clutch applies. The K2 clutch inside this drum comes on for the 2-3 upshift and stays on through third, fourth and fifth, and its apply oil is fed through rings on the drum and shaft. The drum also carries the exciter ring that the n2 Hall-effect sensor in the conductor plate reads, which is how the TCM measures input speed and calculates gear ratio. Inside the drum, a bushing (on later units a caged needle bearing) pilots the front of the output shaft. The input shaft also carries torque converter lockup apply oil down its center.
A 2-3 flare on a 722.6 is just as often caused by valve body wear or a failing conductor plate, so scan for codes and check the fluid level on the wheels at operating temperature before you pull the transmission. Our 722.6 C-Class shift problems guide walks through separating hydraulic flares from clutch slip. With the unit apart, ATSG notes that premature failure of the K2 drum bushing is common and can take out the planetary set, so check the bushing for wear, the output shaft pilot for scoring, the drum for cracks, and the n2 exciter ring for damage. If the conductor plate sensors were hit by debris, replace them as well with a 722.6 conductor plate and filter kit.
This drum is listed for the 722.6 for 2000 to 2006. That window spans a design change: Mercedes upgraded the K2 drum from a bushing to a Teflon sealing ring and caged needle bearing, and the upgrade package paired the new drum with a new output shaft because the pilot diameter changed. Match the pilot design and the gear ratio set to your output shaft before installing, and do not mix parts between the W5A 330 version (4, 5 and 6-cylinder engines) and the higher-torque versions behind V8 and V12 engines, since ATSG notes the planetary ratios differ and are not interchangeable. Compare the photo and the shaft length with your old part, or send us your year and VIN to confirm. Every 722.6 and 722.9 part we carry is on the 722 parts collection page.
If the drum failed because the bushing let the gearset run off center, expect clutch damage as well, and the 722.6 banner rebuild kit supplies the seals and gaskets for the rest of the job.
| Fits | 722.6 2000-2006 |
| Part type | Input Drum |
| Condition | Used |
| 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.
Yes. On the 722.6 the K2 clutch drum, input shaft and front internal ring gear are one assembly, which is why it is sold as the input drum.
It is listed for 722.6 units from 2000 to 2006, which covers those years, but the 722.6 had several versions and the K2 drum changed from a bushing to a needle bearing pilot. Match your old drum and output shaft, or send us your year and VIN to confirm.
A drum problem usually shows as slip in third, fourth and fifth, damaged bushings or debris in the pan, and planetary whine. Valve body wear tends to cause flares on specific shifts with clean fluid, so check codes and fluid first.
K2 piston seals, sealing rings, frictions and steels, a filter and MB 236.14 fluid. Inspect the output shaft pilot, the planetary gearsets and the converter sleeve, and replace the conductor plate if the speed sensors were damaged.
No, it is a used original-equipment Mercedes-Benz drum and shaft assembly, ready to install after the usual inspection of the bushing, splines and sealing ring lands.
