722.6 NAG1 Transmission Valve Body Assembly Replacement

Replacement valve body for the Mercedes 722.6 five-speed automatic. Chrysler, Dodge and Jeep sold the same transmission as the NAG1 (also written W5A580 and W5A380), so this unit covers both sides of the family. Listed fitment includes Chrysler 300 2005-2011 (3.5L, 3.6L, 5.7L, 6.1L), Crossfire 2005-2008 3.2L, Dodge Challenger 2008-2011 (5.7L, 6.1L), Charger 2006-2011, Nitro 2007-2010 4.0L, Jeep Grand Cherokee 2005-2011 and Commander 2006-2010, plus Mercedes CL500, CL550, CL600, E300, E320, E350 and S600 through 2011.

Match the casting and the valve layout in the photos to your own unit before ordering. The 722.6 ran for well over a decade and the body changed in detail between early and late builds, so compare the manual valve end and the solenoid pockets rather than going by year alone.

The classic 722.6 complaint is not actually the valve body. It is the conductor plate and its speed sensors going open, which throws the transmission into limp mode in second or third gear. If you have already replaced the conductor plate and the 13-pin connector and the unit still bangs into gear, holds a gear, or slips on the 2-3, the valve body is where to look next. Wear in the shift and regulator bores lets pressure bleed off and the clutch apply goes soft. Plan the job with the fluid already drained: drop the pan, pull the filter, disconnect the conductor plate, then remove the valve body bolts in a crossing pattern so the separator plate stays flat. On reassembly torque evenly, refill with the specified 236.10 or 236.14 fluid, and reset the adaptations so the shifts relearn instead of banging.