my vehicle is 97 grandprix gtp supercharged 3800 seriesII. My car starts normally, everything is fine with it, except when ever i switch it to R,N,D,3,2,1 it works only for like 1 minute and then everything acts like the car is in Neutral. What i am trying to say is that, when i freshly start my car and put the shifter from P to D, it goes in gear but then when its warmed up it wont simply goes in any gears at all, then i switch it to NEUTRAL or Reverse nothing happens, no switching movement nothing, then i turn my ignition off, and then restarted my vehicle same thing, it shifts to all of them R,N,D,3,2,1 but as soon as i start to drive it doesn't want to pull the vehicle. I checked the shifter cable, its fine and i also inspeted the tranny it was replaced by the previous owner back in 2008 june. u think it my torque converter? i hope my explaination is understandable!
PLZZ ANY HELP WOULD BE APPRECIATED