If your Jerico has a roller bearing in theJune 12 2017 at 11:27 PM
DaleP (Login Posi-67)
Response to Transmission yoke question
tailshaft housing you should be using a billet yoke. Odd thing about the driveshaft "whip" is it seems like Mark Williams are the only guys who care and address what they call critical speed. I doubt you need to go to a Carbon Fiber shaft for what you are doing but I'd suggest using the good yoke you have and get a 4" steel shaft made.
One of our Forum members has a 66 Fairlane that used to run a Jerico and he likely still has a driveshaft for you. For sale or not, I don't know but he will probably respond shortly.