If you have the SSS type transfer case it should work in short bursts on the dyno without the front shaft. It's people like me with the lamo AWD transfer case that can't.
I have an SS one and I am still not going to do it. My wife wants my truck parked for a year if it breaks again. . . . . . ..I don't think so. . . .
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.