Mercruiser gear set pinion and forward

Outdrive model number, year and serial number
120 / 140 ratio 1.98 years 1972 to 1982 #3469428-6225576
470 / 485 ratio 1.84 years 1976 to 1982 #4208730-6225575
160 Note N/A will not fit
165 ratio 1.65 years 1972 to 1981 #3469428 and up
888 ratio 1.50 years 1971 to 1977 #3106717 and up
225 / 233 ratio 1.50-1.32 years 1974 to 1977 #3856268 to
898 / 228 ratio 1.65-1.50 1977 to 1982 #4782330-6225578
250 / 260 ratio 1.5-132 years 1977 to 1982 #4791300-6225576
Type R all ratios year 1983 only #6225577 and up
Mercruiser Tech support outdrive drawings