Gearbox Mercedes 722.9

The Mercedes 722.9 or NAG2 7-speed automatic transmission has been produced since 2003 and is installed on most of the group’s models, gradually giving way to the 9G-Tronic. All AMG versions are equipped with the SpeedShift MCT modification with a clutch instead of a valve body.

This series includes: 722.3, 722.4, 722.5, 722.6, 722.7, 722.9, 725.0.

Specifications

Production years since 2003
Type automatic transmission
Number of gears 7
Type of drive all wheel / rear
Engine volume, l up to 3.5 (modification W7X550)
up to 5.5 (modification W7A700)
up to 6.3 (modification W7B700)
Torque output, Nm up to 550 (W7X550)
up to 700 (W7A700)
up to 850 (W7B700)
Recommended oil MB ATF 236.15
Oil capacity, liter 8.6 (W7X550)
8.9 (W7A700)
9.1 (W7B700)
Replacing the oil every 60,000 km (W7X550)
every 65,000 km (W7A700)
every 70,000 km (W7B700)
Replacing the filter every 60,000 km (W7X550)
every 65,000 km (W7A700)
every 70,000 km (W7B700)
Gearbox lifespan, km ~200 000

Gear ratios Mercedes 722.9

Using the example of a Mercedes C-Class 2015 with a 2.0 liter engine:

Main 3.070
1st 4.377
2nd 2.859
3rd 1.921
4th 1.368
5th 1.000
6th 0.820
7th 0.728
Reverse 3.416

The transmission was installed on:

  • Infiniti Q50 1 (V37) in 2013 – 2020;
  • Infiniti Q60 2 (CV37) in 2016 – 2022;
  • Infiniti Q70 1 (Y51) in 2015 – 2022;
  • Mercedes C-Class W204 in 2007 – 2015; C-Class W205 in 2014 – 2018;
  • Mercedes E-Class W211 in 2005 – 2009; E-Class W212 in 2009 – 2016;
  • Mercedes M-Class W164 in 2005 – 2011; M-Class W166 in 2011 – 2015;
  • Mercedes S-Class W220 in 2004 – 2005; S-Class W221 in 2006 – 2013;
  • SsangYong Chairman 2 (W) since 2008.

Disadvantages of the Mercedes 722.9 gearbox

  • The most famous problem with this automatic transmission is the failure of the control board.
  • Two hard-working solenoids: EPC and TCC are also not reliable.
  • Vibrations from aggressive acceleration quickly break the automatic transmission housing bell.
  • It is not uncommon to replace the multi-function switch or servo module.
  • Other breakdowns can be avoided if you monitor the condition and level of the oil.

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