This is a 10″ diameter 3800 to 4200 stall Torque Converter to fit 4L80E Transmissions. This Converter features three bolt patterns to fit Small Block, Big Block and LS Engines. During checkout there is a place to leave us a message. Please specify which engine you have and we will be sure to sent the correct converter. This Converter has all the best upgrades for many years of trouble free performance. Anti balloon plate process 90 hardened pump drive hub. Torrington bearings thru out. Oversized Billet Steel Lock up Clutch Plate. High performance high carbon lockup clutch. Billet Steel front cover. All internal fins are brazed. Turbo, Blowers and Nitrous are fine as this converter is rated to 900 Horsepower.