i was considering running these square shafts on my mud truck (s10 with fullsize driveline) due to 18" shortend rear driveshaft (from a fullsize shaft) and a 6" lengthened driveshaft in front (s10 shaft with SAS) But simply added a CV joint up front and lobbed off the rear yoke and re welded it on..
saved myself about oh $160 buyin all the stuff from TSC, it really does help having some welding skills when into wheelin
But making them correctly is the key, being too long (bottoming out on slip yokes) can lead to smashing transfercases and other breakages while playin. Even being out of round or extremely out of balance can lead to cracking parts.
nice writeup tho! oriented toward the beginning fabricators