This is how to install the helical cut quiet gears in a V8 QC . You must check the end play from the shoulder of the gears with a straight edge across the housing with the gasket in place . It will be from 0.020 to 0.080 , order the correct shims from your supplier with the gears . You must not have too much gap as the gear will hit the bearings each time you accelerate otherwise . If you don't want the noise this is the way to go ..