Regular power steering is 15.7:1.

Fast ratio arm on it obviously makes it less than that. On cars that came with the fast ratio arm had a steering box with different stops, same ratio though. According to Firm Feel the p/s ratio with the longer arm is 12:1.

Manual boxes can be 24:1, 20:1 or 16:1, the 24:1 and 16:1 ratios are available new at RockAuto.

I don't know what your other vehicles are, much less what their actual ratio is.