i have a 1954 half ton chevy truck speedometer does not work. it has a sm420 4 speed just changed the clutch,fixed the shifter pins . decided to go at the speedometer problem while the trans was out of the truck. so i unscrewed the bullet looking part out of the cover at the back of the trans.( enclosed drive shaft ) now i need to find a working new or used speedometer gear . this trans has a cover over the two bearings the output shaft showing inside the bell with 4 screws onit.