72 Demon Driveshaft

Why not bite the bullet one time and have a new shaft with new yokes and u-joints built? One and done, then you are not relying on 50 year old parts and a potential failure. I used to run older shafts until my bracket car twisted one or two open like a can of biscuits. For a street car, a normal steel shaft would be fine. I'm running slightly higher horsepower and leaving off of a transbrake, so that is why I run new driveshafts and have them checked annually.