Castings

 Muncie Casting Numbers

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MAIN CASE CASTING NUMBERS
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 ( rare )
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 1969 – 1974 (some early 1975 cars) 1" Bore Patent Number

 

TAILHOUSING NUMBERS
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
Used up to 1970 in some Pontiac Models

384362 1963 – 1964 Long Tail Driver Side Speedo 27 Spline
9779246 1964 – 1965 Pontiac Catalina Long Tail Pass. Speedo 27 Spline
3857584 1966 – 1970 Passenger side speedo, 27 spline
3978764 1970 – 1974 passenger speedo, 32 spline output

 

SIDE COVER NUMBERS
3831717 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.