Main Case

3831704	1963 Only small 6207NR Front Bearing ,Pat. Pending, 7/8" Bore
3839606	1963 - 1964 Regular Bearing Pat. Pending, 7/8" Bore
3851325	1964 -1965 7/8" Bore Patent Pending Mostly 1964
3851325	1964 –1965 7/8" Bore Patent Number
3864848	1965 7/8" Bore Patent Number
3864_____	1965 Milled off last 3 digits 7/8" Bore Patent Number
3885010	1966 -1967 1" Bore Patent Number
3925660	1968 – 1970 1" Bore Patent Number
3925661	1970 – 1974 (some early 1975 cars) 1" Bore Patent Number

Tailhousing

3831731	1963 "Thin Fin Tail" Driver speedo 27 spline
3846429	1963 "Thin Fin Tail" Driver speedo 27 spline
3846429	1963-1965 Regular thick web, driver speedo, 27 spline
9779246	1964 – 1965 Pontiac Catalina Long Tail Driver Speedo 27 Spline
3857584	1966 – 1970 Passenger side speedo, 27 spline
3978764	1970 – 1974 passenger speedo, 32 spline output

Side Cover

3831707	1963-1965 Early side cover stud type shift shafts
3884685	Cover issued with "584" tail stud type shift shafts
3950306	Short boss with bolt on type shift shafts - no switches
3952642	Long boss bolt on type w/ TCS switch on 3-4
3952648	Short boss bolt on type w/ TCS switch on 3-4
335308	Long boss bolt on type with neutral safety switch. Some have a boss for the switch that is cast but not machined on 1-2.