The planetary gear set is a compound epicyclic planetary gear set, whose bands and clutches are actuated by hydraulic servos controlled by the valve body, providing two or more gear ratios. Are you experiencing loss of power upon acceleration? Is your automatic transmission unable to go into gear? Is your automatic transmission not shifting? Is your automatic transmission shifting hard or sifting late? Is your automatic transmission slipping? Is you automatic transmission making a chatter or grinding noise? Is your automatic transmission leaking fluid? Is your car or truck not drivable? Sergeant Clutch Discount Transmission Repair Shop San Antonio, Texas offers FREE Transmission Performance Check.