[Bustingear]

I know it is a Ford open drive post 1939 with the desireable large double detent shift tower but I am trying to find out the 1st, 2nd ,and 3rd gear ratios. Anyone close to these?
Number on the base rear case 78-7006
Number on Shift Tower 81A-7222B
Serial number on upper bell area 799C-I 906942

Thanks