65 barracuda - fluids

Your A833 tranny is going to use 85W-90 gear oil, GL4 specification (with no friction modifiers) Almost a gallon.

Your rear differential will take 80-90W or 85W-90 too and if it happens to be a sure grip unit will need a bottle of Mopar Sure Grip axle additive - 4318060 (or anybodies friction modifier additive, don't tell anybody but I get mine from the Ford dealer because he has it on the shelf)