About the t-53 having the reduction gearbox, you had made that clear in a previous post. What threw me off was the fact that you later said that the tq tube would not handle the rpms. That's why i brought up the question.
And yes for an all out race car i'm sure one would HAVE to have a custom reinforced shaft of some type to bolt to the axle. It could get really expensive when you start twisting driveshafts/tq tubes like they were tooth picks, ha, ha.