Originally posted by meansam:
ration of sprung weight to unsprung weight
I hadn't thought of that aspect, but I think you'd need an engineer with a slide rule (showing my age!) to determine just how much of the torque tube was sprung versus not and how much of the driveshaft ends up as unsprung weight.
Unsprung weight also has a significant impact on handling and that would be another consideration.
And of course in the case of a IRS with a torque tube (C5 or C6 vette) you aren't going to have any unsprung weight from the driveshaft. There is one guy I know of who was talking about building a hot rod Task Force pickup on C5 stuff, so it does have some connection to old trucks. I don't know if he did it or not and I've not seen any pictures.