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Eddie, at first I thought 8:1 reverse was way out of line but lo and behold you were not far off My '68 Ford Shop Manual says reverse is 8.258:1. I don't believe the ratios changed much if at all through the years to '78. Hope this helps.
Eric
Proud owner of a '73 F-250 4x4 High Boy, 460 V8, NP435, NP205
And a '68 Bronco 289 v8 , NP435 , Dana 20
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.