722.9 Overhaul Kit, new and ready to install. Fits the 722.9. Ships fast from the USA.
If your Mercedes C350, E350, ML350, GL450, S550 or R350 with the seven-speed automatic drops into neutral on the shift into third, flares between gears once it warms up, or has burnt fluid and lining dust in the pan, the unit needs to come apart. This 722.9 overhaul kit is a full master set for that job: the overhaul kit of gaskets and seals, a friction kit and a steel kit, sold as rebuild set T18900A. It is listed for the 7G-Tronic in rear-drive and 4MATIC Mercedes-Benz cars and SUVs from 2004 through 2010.
Mercedes introduced the 722.9 in 2003 as the first seven-speed automatic in a production car. It uses four planetary gearsets, three clutches and four brakes to make seven forward gears and two reverse ratios, and it has no bands. That means every gear depends on multi-plate packs holding under pressure. The control unit sits on the valve body inside the case and manages each apply by controlling solenoids. When the frictions glaze or a piston seal leaks, the control unit sees the ratio change late, raises pressure to compensate, and eventually gives up with a fault and a limp-home gear. Renewing the frictions, steels and all the soft parts together gives every pack a clean starting point.
Gears reports that most 722.9 failures start with the small O-rings on the solenoid tips. A cut or missing O-ring leaks pressure from one circuit, and the clutch it feeds burns. That means burnt packs are often the result, not the cause, so inspect every solenoid tip when the valve body comes out and treat the solenoids as part of the job. Scan for stored codes and save the adaptation values first; our Mercedes full-system scan tool reads the transmission control unit and resets adaptations. Then pull the pan: lining material and metal confirm a rebuild. Our pressure control solenoid symptoms guide shows how a pressure control fault feels from the driver's seat, which helps separate it from worn packs.
The kit is listed for the 722.9 in these Mercedes-Benz models: C230 and C280 (2006-07), C300 and C350 (2006-10), C63 AMG, CLK350 and CLK550, CLS550, E350 and E550, ML350 and ML550, GL450 and GL550, R350, S550, SL550, SLK280, SLK300 and SLK350, plus the V8 500-series cars from 2004-06, the G500 (2007-08) and the 3.0L diesel E320, ML320, GL320 and R320. Mercedes built the 722.9 in several torque versions and updated internal parts during production, so lay the plates and seals beside your originals during teardown. If you want us to check it first, send the year and VIN. Later 2011-on units are not on this list. If your packs are healthy and you only need seals and pistons, see the 722.9 overhaul and piston kit for 2005-2010. All 722 parts are in the 722.6 and 722.9 collection.
| Fits | 722.9 |
| 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.
It is a master set, T18900A: the overhaul kit of gaskets and seals plus a friction kit and a steel kit. Pistons, filter, solenoids, bushings and the torque converter are not included.
The fitment list ends with 2010 models. Later 722.9 units can use different internal parts, so send us the year and VIN before ordering for a 2011-on car.
ATRA's Gears magazine connects that symptom to a failed molded piston, most often in the K1 drum. Replace the pistons along with this kit.
At minimum, renew the O-rings on every solenoid tip. Gears reports leaking solenoid O-rings as the most common start of a 722.9 failure, and a leak will burn new clutches.
Yes. Reset the transmission adaptations with a Mercedes-capable scan tool so the control unit learns the new clutch fill times, then do a gentle road test.
