Gear ratios from multiple Type I Beetle Trannys. I need help?

A couple of kids (Mine) are trying to build a bug and I am trying to educate them on Gear ratios and why not to do certain things due to cooling and power but I need some help also.  Can anyone help me on the following missing info?
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R&P        1st Gear                    2nd Gear                    3rd Gear                    4th Gear             REV
4.375 (AM)     ?.??        ?.??        ?.??        .93?   
4.125 (AH)    3.80        2.06        1.26        .89                   3.61
3.88(AT)        3.80        2.06        1.31        .82
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