The point of this constant adaptation is to account for variation in assembly tolerances and clutch wear over time. The TCU in the 722.9 transmissions is constantly self-adapting by adjusting clutch pack fill times and pressures. Despite that, however, there still can be shifting issues related to transmission adaptation as well as hardware issues such as a failing TCU or clogged solenoids. Over time, Mercedes has made improvements through software revisions and the use of new fluid. The early converter based AMG models had slow and sluggish shifting as well as harsh downshifts when slowing to a near stop. Nearly from introduction, the 722.9 transmissions have been known to have issues with shifting. With 7 forward speeds, gearing is both aggressive for acceleration, and conservative in the higher gears to aid fuel economy. The design allows for skipping of gears during certain downshift operations helping to create a sporty feel and quicker response. Variations of the Mercedes 722.9 transmission can be found in nearly every Mercedes model from 2006 to 2017.
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