Roller sprag failure PowerGlide. This was the result of a street burnt out. Continued driving grinds the components up like a concrete mixer in a short time. If you suspect a problem, noise, loss off power etc. IMMEDIATELY stop the engine and have your vehicle taken to a transmission expert for diagnosis. The ground up parts in this example have contaminated the whole transmission and cooler. This supercharged GM should have had a billet back, furnace brazed, anti-balloon plate, steel turbine hub, Mechanical Diode one way clutch, needle thrust bearing equipped, race converter fitted as was advised but declined by owner.