My 700r wont engage in gear. Heres the story Last night I went to the local rodeo and a guy was stuck out in a field. I tried to pulll him out but had no luck cause of the soft ground when ever I tried to get to him i would sink. I got bogged down in the mud and was able to rock it it. I pulled on drie land and went to move my chain to get it from a differnt angle and it would not engage in gear r,od,d,2,1 nothing worked. I got under it and all the shifter were engaging. I waited 30 minutes and it shifted in gear. On my way home it was slipping real bad at first would not shift into 3rd then it would only move in second. Now when i first start my truck it shift fine but after 4 or 5 shift it starts to slip and then go to neutral. If i kill my truck and start it up agian then it will engage in gear. So im guess my trans is pretty much shot. But i dont see why all of a sudden it just stoped. It didnt slip any when i was getting un stuck. The hole time i was doing this i was in 4lo so it would be easyer on my tran. I have 410 gears and 33s. Could me throwing into drive and reverse back in forth when i was rocking it out destroyed my trans or is my trans shifter out of wack some how?