Stock sammy t-case high range is 1.409
5.125 (axle ratio)      (multiplication factor of sammy High range reduction)
x .409
----------------------
2.096125 ÂÂ
2.096125
+5.125
========
7.221125
7.22:1 High range rear axle ratio is GoodÂÂ
Do this in one step!
Don't "drop the 1", and don't do the adding:
Your ratio should have been calculated as:
1.409 X 5.125 = 7.22:1 (same answer, but no need to split them, and add them!)
So when I calculate my lowest gear (I have the 4.24:1 transfer case, and 5.83:1 diffs), I get:
3.65 (first gear ratio) X 4.24 (low range) X 5.83 (diffs) = 90.22:1
Now THAT is an excelent rock-crawling ratio.