To know the rear gear ratio of a *specific* 1969 Charger, you'd need to check:
* The vehicle's build sheet (if available): This document will list the options, including the rear axle ratio.
* The axle tag: Located on the differential housing, this tag usually contains the gear ratio.
* The owner's manual (if available): This might list the specifications.
Without knowing the specific Charger, it's impossible to give a definitive answer.