If you dont have the torque converter locking up with an exhaust brake you will burn that transmission to the ground.
2006 was the first year that you could get a dealer installed factory option on a dodge for an exhaust brake with an automatic. Prior years I was told the trans wasn't smart enough to communicate with an exhaust brake.
Now, aftermarket stuff...I'm not as familiar with, just the cummins exhaust brake...btw it was awesome...
mac 'saved brakes' gyvr