First, go to your auto parts store and purchase your favorite tranny cleaner additive. (Mine is Outlaw brand) put it in. Then block the wheels from moving foward and reverse (or put it up against your house). Next start the car and put it in drive. Then leave it running for 15 minutes. Next do the same thing for reverse. Then change tranny fluid and filter. Now your transmission should shift like a brand new car.

I did this once and it worked so well!