This replacement flywheel ring gear fits all Chevrolet cars & trucks from 1929-1933. It has 104 teeth and must be heated to be installed on the flywheel. Flywheels that do not have a replaceable gear will require turning of the flywheel to install the new gear. There were three different widths of ring gears available in these years. OUR GEAR IS 1/2" WIDE. Dimensions: ID 12.19" x OD 13.183" x Thick .492", 104 Teeth. Compare to your original before ordering.