GSRX,

Someone in Denmark(somewhere out there) did it. It is not hard to do. The 722.6 has pressure regulator solenoid that oscillates at around 1000 to 2000 Hertz and the solenoids have to be fired in sequence, and fired in sequence in down shifting.

The hardest thing is to get the auto up shift and auto down shift.

A poor mans manual shifter would be easy to create for the 722.6-like a paddle shifter using a Arduino and some transistors.

The person in Denmark did it with a Arduino Embedded development board-these are $40-the high school systems of the US are teaching kids to program on Arduinos.

The 722.6 is the best transmission for anything and everything-Power capacity-very easy to DIY repair-longevity is 20 to 30% more then other Mercedes transmissions-It tolerates lots of abuse-Mercedes newer V12 cars still come with the 722.6.

The great thing is the third party transmission parts makers make all the soft and valve body parts. Valve body parts on the other Mercedes transmissions are non existant, so one is forced to buy the whole valve body at a one to two thousand(at that price it throws the idea of DIY out the window). Oh, Chrysler use it too-Crossfire-Jeep Commander-I think the Charger...

Here are some good links:

Transmission

www.MSgpio.com • View topic - Mercedes-Benz 722.6 (NAG1) Automatic Transmission

mercedes transmissions

Everything you ever wanted to know about a NAG1 valve body - Cherokee SRT8 Forum

Martin