The frame design is what led me to try a project like this. Straight tip to tip with brackets, buckets and trans mount that made stretching it very simple. Relocating rear tube to front gave me the 109" wheel base. So basically a completely stock drivetrain with a more desirable wheel base and only slightly more caster up front.
As for the differences in axles? The early 411's had the 404 style axles only narrower. Apparently the late model 411's have the same housings as the 421, 406, and 416's. The ratios seem to differ a little, mine are 8.89 to 1. I will have to check on widths and such. I am counting on the strength being far better than a 60. Even if it were equal to a 60, how could anyone pass up the extra clearance. ???
I hope this helps and thanks for the kind comments, Tyson