This is a new old stock auto part NOS gm in old original gm box This is the reverse counter gear assembly fits truck models with 4 speed manual transmission shows as a 23 tooth gear gm part # 591397
listed as fitting
- 1948 1949 1950 1951 1952 1953 1954 1955 commercial and utility truck models 1st series with 4 speed
- 1955 1956 1957 1958 1959 all series 3 and 4 with 4 speed
- 1960 1961 10 thru 40 truck with 4 speed
