You can use the info from the attached diff drop instructions to see how to drop the pumpkin. My solution to replacement axles was to change over to newer Trooper axles and CVs. What this does for me is gives me a much larger source of used half-shafts in junkyards. I may still (and do) break my CV joints when hard wheeling but I just replace them with spares source from my local pick-n-pull.
Scott