SM465 Gear Ratios are:

First Gear - 6.55:1
Second Gear - 3.58:1
Third Gear - 1.70:1
Fourth Gear - 1.00:1
Reverse - 6.09:1

SM420
1st Gear Ratio .... 7.05
2nd Gear Ratio .... 3.57
3rd Gear Ratio .... 1.70
4th Gear Ratio .... 1.00
Reverse Gear Ratio .... 6.78