722.6 Clutch Module 2001, new and ready to install. Fits the 722.6. Ships fast from the USA.
Starting with 2001 production, the 722.6 five-speed changed its K2 clutch to a small inside-diameter friction, and a rebuild on any of those later units needs frictions cut to match. This new friction module, reference R78119C (interchanges with Raybestos RCP96-027), is that 2001-up small-ID K2 set. It is the module to reach for when a 2001-or-later Mercedes such as the W203 C-Class, a 2001-2007 Sprinter van or a 996-generation Porsche 911 Tiptronic with the 722.6 comes in slipping, flaring between gears or with friction debris in the pan.
The 722.6 makes its five forward speeds and reverse with three planetary gearsets, three multi-plate clutches (K1, K2, K3), three multi-plate brakes and two freewheels; there are no bands. The electronic controller and valve body feed pressure to the right combination of packs for each gear and time the overlap as one releases and the next applies. K2 is applied in several of the forward gears, so its frictions log a lot of slip time over the life of the unit. When the lining wears or glazes, the pack takes longer to lock, the controller sees the ratio change run long, and you feel it as a flare or a slip. Replacing every friction at once, rather than the single worst pack, keeps all the packs at the same starting point so the adaptations relearn evenly.
On later 722.6 units, a lot of slip complaints are actually pressure problems. Transmission Digest documents a leak at the input shaft sealing that robs the converter circuit and lowers cooler flow, and on the Chrysler NAG1 version, bulletin 21-033-14 fixed an erroneous P0730 and hot hang-in-gear with a controller flash rather than a rebuild. Read codes, verify the fluid level hot per the factory procedure, and drop the pan. If the filter and magnet are loaded with friction material, the packs are worn. The C-Class 722.6 shift problems guide and our E-Class 722.6 problems guide lay out the diagnosis step by step.
This module is listed for the 2001 722.6 and is the 2001-up small-ID K2 design. Earlier units used a large-ID K2 friction, so a transmission built before the change needs the 1996-2000 large-ID module or the 1998-up thick-K3 version. Production changes do not always line up with model years, so measure the inside diameter of your old K2 frictions against this set, or send us your year and VIN before you order. The 722.6 was also built in the larger W5A 580 form for V8 and V12 engines, so confirm the transmission number on the case plate. You can see every part we carry for this transmission on the 722.6 / 722.9 parts page.
| Fits | 722.6 2001 |
| Part type | Clutch Module |
| Condition | New |
| Brand | OEM |
| Reference | R78119C |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Measure the inside diameter of one of your old K2 frictions and compare it to the K2 plates in this set. The small-ID version is the 2001-up design. If the unit is still assembled, send us your year and VIN.
Sprinter vans from 2001-2007 used the 722.6, and this module is the 2001-up small-ID K2 type. Confirm the K2 inside diameter or send the VIN before ordering, because van units can differ.
It can be, but check fluid level and cooler flow first. A worn input shaft seal or valve body wear can cause hot flare with usable clutches. Friction material in the pan confirms worn packs.
Yes. The module is frictions only. Replace piston seals, sealing rings, gaskets and the filter while the transmission is apart.
Fill and check the fluid hot per the factory procedure, then reset the transmission adaptations with a scan tool and drive through all gears so the controller relearns.
