I think I explained it completely wrong. So after a long research I came to a conclusion that I have the 4t60 vacuum controlled tranny. My symptoms: When I start the vehicle up..no matter if its a cold start or its been running for a while..it won't budge if I put it reverse or drive right away. If I just let it run for at least a minute or two and then shift into a gear, it will move. Very weird. Other than that..the tranny is flawless.