I'm assuming you have to be driving, but my question is do you have to be driving or can you just run the car and maybe shift the gears from time to time I'm willing to try it but I don't think this will not work for me because I have a very bad leak and bad slipping. Sometimes they will be no motion forward or reverse but if I turn the car off and restart it I'll have forward and reverse motion again. I drove home 50 miles like this it was very slow but sometimes I would get up to 50 miles an hour and had to keep adding transmission fluid. Seven quarts that night