Someone else suggested a worn pilot bushing in another post on this subject. I'll add rear output shaft bushing and front driveshaft yoke to the list.
Lots of things to wear out on 60+ year old trucks.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine