722.4 Input Drum, new and ready to install. Fits the 722.4. Ships fast from the USA.
This page is filed under input drums, but the part you receive is not a drum. It is a new 722.4 transmission overhaul gasket and seal kit: the paper gaskets, rubber O-rings, lip seals and sealing rings you need to put a Mercedes four-speed back together after it has been apart. If your 190E, 190D or first-generation C-Class is dripping red fluid onto the driveway, takes a long pause to grab Drive on a cold morning, or you already have the case split on the bench and need fresh rubber before reassembly, this is the kit you are looking for. It is an aftermarket set, sold new, and it does not include clutch plates, steels, a filter or bushings.
Mercedes coded the 722.4 as the W4A 020: the small, 196 Nm member of the hydraulic four-speed family, first delivered in 1982 and built until the mid-1990s. There is no solenoid pack running the shifts. A vacuum modulator reads engine load, a Bowden cable from the throttle sets shift points and kickdown, and the valve body routes oil to three brakes and two clutches plus a one-way clutch. Every one of those apply pistons is sealed by rubber, every shaft passage by a sealing ring, and every joint in the case by a gasket. The fluid that applies a clutch has to reach it at full pressure. Once seals that are thirty years old go hard and shrink, oil leaks past them before the piston is fully applied, so engagement gets soft and slow, and oil also finds its way out of the case at the pan, the selector shaft and the front pump. Renewing all of that sealing in one teardown is what this kit is for.
Find the leak first. Clean the case, drive the car, and look for where fresh fluid appears; a weeping pan gasket on a 722.4 is a simple job, while a front seal means pulling the transmission. Then rule out the controls before blaming internals. A Mercedes adjustment guide for the 722.3 and 722.4 checks the fluid level, the vacuum supply and modulator, and the Bowden cable setting before anyone condemns hard parts, because a mis-set cable or a split vacuum hose makes these units feel worn. If the unit slips once warm with the controls right, plates are worn too and you need more than seals. Our 722.6 problems and fixes guide follows the same order on the later five-speed, and the C-Class problems guide helps if you are not sure which transmission your C-Class has.
The kit is listed for the Mercedes-Benz 722.4 only. That covers the four-speed automatic in W201 190-series cars and the early W202 C-Class with the smaller four- and six-cylinder engines. Do not confuse it with the larger 722.3, which shares the design but uses a bigger case, or the 722.5 five-speed, which adds a separate overdrive housing with its own joints and seals. Read the case number stamped on the case edge above the pan gasket near the bell housing; it should begin with 722.4. Mercedes made running changes during production, so lay the new gaskets over the old ones before you start gluing anything. If you are unsure, send us your year and VIN and we will check it. All our parts for this family are in the Mercedes 722 transmission collection.
If your teardown shows burnt plates, the 722.4 master rebuild kit adds frictions and steels to a complete seal set. A shift that is harsh rather than leaky is often a valve body issue, and the 722.4 shift correction kit goes in while the pan is off.
| Fits | 722.4 |
| Part type | Input 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.
No. Despite the listing name, this is a new 722.4 overhaul gasket and seal kit. It does not include a drum, clutch plates, steels, a filter or bushings.
If your 190E has the four-speed automatic, it is a 722.4. Confirm by reading the number stamped on the case above the pan gasket near the bell housing, or send us your VIN.
No. The 722.3 uses a larger case and the 722.5 adds an overdrive housing with its own gaskets and seals. This set is for the 722.4 only.
To use the full kit, yes. The front pump seal, piston seals and sealing rings all require removal and disassembly. A pan gasket leak alone can be fixed in the car.
Use a Mercedes-approved ATF and check the level hot on level ground. Mercedes service data notes that its later ATF 3353 can also be used in the older 722.3, 722.4, 722.5 and 722.6 units.
Only if the plates are still good. Slip after warm-up usually means worn frictions as well, so inspect the packs and consider a master rebuild kit that includes frictions and steels.
