722.9 Overhaul Kit 2004, new and ready to install. Fits the 722.9. Ships fast from the USA.
Most 722.9 overhaul kits are a box of seals and gaskets. This one is a larger package aimed at the all-wheel-drive 7G-Tronic: alongside the full overhaul seal set it includes a friction plate module, a replacement piston kit and a new oil filter. It is listed for 4MATIC versions of the Mercedes-Benz 722.9 from 2004 on. If your 4MATIC C, E, S, CLS, GLK, ML, GL or R-Class has burnt clutches, slips once the fluid is hot, or falls into neutral as it shifts into third, this covers the soft parts of the job in one order. Steel plates are not part of it, so check yours at teardown.
The 722.9 has no bands and no one-way sprags. All seven forward gears and both reverse gears come from three clutches (K1, K2, K3) and four brakes (B1, B2, B3, BR) applied by hydraulic pistons. Every one of those seven packs depends on two things: the piston seals and sealing rings holding pressure, and the friction lining still having enough material to grip. The overhaul portion of this kit renews the gaskets, seals, sealing rings and O-rings. The friction module replaces the lined plates. The piston kit matters more on this transmission than on many others because the molded pistons are a known weak point, and the filter is the part you always change on a rebuild. Not included: steel plates, the torque converter, the valve body, the conductor plate and the transfer case internals.
Gears magazine reports that most 722.9 failures start with deteriorated O-rings on the solenoid tips. A leaking solenoid starves its clutch until it burns, so the failed pack is the result, not the root cause. Plan to reseal the solenoids and inspect the valve body springs and regulator bore while the unit is apart. Before any adaptation reset, Mercedes-Benz bulletin LI27.00-P-051451 says to read out the control unit's log and EEPROM data, because a reset erases it. Pull codes, check the fluid level and smell, and drop the pan to look for lining material. Our 722.6 common problems guide walks through the valve body wear that drives clutch failures in the five-speed generation, which is worth knowing if you work on both.
The kit is listed for the 722.9 (NAG2, 7G-Tronic) with AWD or 4MATIC drivetrain, 2004 and later, select applications. Reference vehicles include 4MATIC versions of the C300 and C350, E350 and E550, S350 and S550, and CLS, GLK, ML, GL and R-Class models. Piston configuration and filter design vary by transmission version, so compare the kit to your teardown and case tag, or send us your year and VIN before ordering. Rear-drive 722.9 owners should look at the 722.9 overhaul kit with pistons for 2005-2010 instead. The full range is in our 722.6 and 722.9 collection.
| Fits | 722.9 2004 |
| Part type | Overhaul Kit |
| 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. It includes the overhaul seal and gasket set, friction plates, a piston kit and a filter. Steel plates, the torque converter, valve body and conductor plate are not included.
It is listed for AWD and 4MATIC versions of the 722.9 from 2004 on. For a rear-drive unit, send us your year and VIN, or look at our other 722.9 overhaul kits.
Molded pistons are a known 722.9 failure point. ATRA's Gears magazine links a failed K1 piston to the transmission dropping into neutral on the shift into third, and suggests replacing the brake pistons during a rebuild as well.
Plan on solenoid O-rings or a solenoid kit, steels if yours are heat damaged, MB-approved fluid, and on early units the updated K1 drum and stator support.
Use the MB-approved fluid your 722.9 was built for: 236.14 on most earlier units and 236.15 on 7-speeds built from 2010 on. Do not mix them.
Yes. Read and save the control unit data first, then reset adaptations with a 722.9-capable scan tool and complete a road test at operating temperature.
