I have a 2009 Challenger r/t 5 speed automatic 18,00 miles. This has happen twice and i drive the car about 3 times a week. I the morning i start up the car. Let is warm up about 30 seconds. i put in in reverse and it felt like in was in netural. i put on the gas it started backin up slowly out of the driveway. put it in drive kinda did the same thing! That was about 2 weeks ago. Today i backed out kinda felt like it was doing the same thing. Got the the main highway, the coast was clear so took off, I pressed on the gas a the car started moving slowly. Glad that there was nobody commin! It clears up pretty quick. Like when its warmed up. Only in the moring the temp way about 50 degrees when it happens. Not a expert on anything! i hear these transmissions were m/b and could handle 500hp. I don't know how the check the trans fluid. Ya know what it mean! Any sugestions.