Editing 4l60e reverse failure

well basically i have a 94 k1500 that im redoin. i got it almost done recently when i painte it so i pulled it out of the garage, being a showoff i decided to treat my friends to a couple burnouts. i did a couple powerbrakes in overdrive..probably wasnt the best idea. when i finished ruining a set of brand new tires i was goin to pull it back into the garage to try and remove the layer of rubber off my new paint...i put it in drive, hit the gas and didnt move. i put it in drive and it went forward and shifts through all the gears just fine...so i put it in reverse again put it to the floor and it tried to jump a little and it is still sitting there i wanted to get a second opinion from someone with more experiance before i start to look it through