Jesus. What is wrong with people these days. There is no sound logic in leaving fluid that you KNOW is bad. Seriously, did retard school get out for summer early or something. Think before you type. "I know it's bad but I'm going to leave it for 3-4 years." Come on. Use your noodle. Slipping accelerates transmission failure. the slipping is the frictions not grabbing, which rubs more and more and more friction material off into the fluid. If you wanted a temporary fix you should have put in a Transgo shift kit and got a tune to increase the line pressure. That would make the transmission bite the frictions harder, which MIGHT make the slipping stop. Sounds like you are too far gone though, so I'm just wasting my time typing...since you are ignoring people that are veterans of this platform who know what they are talking about more than I do.