1.85” O.D. – GM #3924098 (later, #6261794); same “large” O.D.
as #3708144, used the same range of 18-22-tooth “small”
DRIVEN gears, and was light green in color.
1.77” O.D. – GM #3924097 (later, #6261795); same “small” O.D.
as #3708145, used the same range of 22-25-tooth “large”
DRIVEN gears, and was medium blue in color.
Courtesy JohnZ