Automatic Transmission Flexplate (Z-494) by ATP®. Teeth Quantity: 139. Diameter: 11.75″. ATP flex plates are made of high quality steel and contain the correct bolt hole spacing and ring gear teeth just like the original part to ensure long life and durability. Balanced to factory specs. When reliability and OE performance is a must, turn to this ATP product designed to provide a precise fit, OE quality, and function.