Frictions, steel plates, pan gasket, seals and sealing rings to rebuild a Mercedes-Benz 722.9 7G-Tronic seven-speed automatic on the bench.
If your Mercedes C-Class, E-Class, ML, GL or other rear-drive or 4MATIC model with the seven-speed 7G-Tronic has started slipping, flaring on the 2-3 or 3-4 shift, dropping to neutral as it tries to grab third, or came back with burnt fluid after a mechatronic or conductor plate repair, the fix is usually a teardown. This kit holds the clutch plates and soft parts a 722.9 (NAG2) needs to go back together with fresh friction surfaces and tight seals.
The 722.9 makes its seven forward gears and two reverse ratios by applying combinations of multiplate clutches (K1, K2, K3) and brakes (B1, B2, B3 and BR) against its planetary sets. Every one of those packs is fed and released by pressure from the electrohydraulic mechatronic unit, and every piston is sealed by molded rubber lips and Teflon-type sealing rings on the shafts. When the fluid cooks, the frictions glaze and the seals harden, so pressure leaks off before the pack clamps and the transmission slips or flares. A rebuild replaces the wear surfaces in one pass: friction plates and steels for the packs, the molded pan gasket, the overhaul gasket set, and the O-rings and sealing rings for the pistons, pump and shafts.
Not every 722.9 shift complaint needs a teardown. Mercedes' own diagnostic bulletin on 7G-Tronic shift quality has the technician read the transmission control unit's fault memory and adaptation values and run the guided tests before any hardware gets replaced. A bad mechatronic, a weak solenoid O-ring, or a valve body bore that has worn can all burn a clutch, and putting new frictions behind the same leak just burns them again. Our 722.9 rebuild cost guide walks through what a shop checks first and where the money goes, so you can tell whether you are looking at a rebuild or a control-side repair.
This kit is built for the Mercedes-Benz 722.9 seven-speed automatic, also called 7G-Tronic or NAG2, used behind most rear-drive and 4MATIC Mercedes cars and SUVs from the mid-2000s on. The 722.9 was revised during production, including changes to the K1 drum and stator support, the pump bushing-to-bearing switch, and the move to the later 7G-Tronic Plus. Before you order, read the production number off your transmission's ID tag and match it to your unit, or send us your year, model and VIN and we will check it. Every part we carry for this family is on the 722 transmission parts page.
The kit is soft parts and clutches only. It does not include the conductor plate, solenoids, valve body, filter or torque converter, so price those separately if your diagnosis points to them.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is built for the 722.9 seven-speed (NAG2) family. Because Mercedes revised the unit during production, match the production number on your transmission ID tag before ordering, or send us your year, model and VIN and we will confirm it.
The kit covers friction plates, steel plates, the pan gasket, the overhaul gasket set and the O-rings and sealing rings. The conductor plate, solenoids, valve body, filter and torque converter are not included and should be priced separately if your diagnosis calls for them.
Replace the molded pistons, the filter, and the solenoid O-rings, and update the K1 drum and stator support on early units. Check the pump and converter hub, since later pumps moved to a bearing and an old-style hub can pit against it and whine.
That symptom most often traces to a failed K1 molded piston and the burned clutch pack that follows. The kit supplies the frictions and seals; the piston itself should be replaced at the same time.
Earlier 722.9 units use red ATF to Mercedes sheet 236.14 and later units use blue ATF to sheet 236.15. Check your transmission build or service data and never mix the two.
Yes. After a rebuild the transmission control unit's adaptation values should be reset and the unit relearned with a Mercedes-capable scan tool, then checked for fluid level at the specified temperature.
