1984 Chevy K20 front driveshaft

cw41

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MAKE:Chev
MODEL:Silverado K20 4x4
YEAR:1984
MILES:145000
ENGINE:7.4
DESCRIBE ISSUE....I'm trying to find the reason for my vibration at speeds of 55mph+. New Michelins and steel rims balanced/roadforced three times, rear driveshaft w/new spicer u-joints balanced, etc. Harmonic balancer appears fine and engine in smooth.
Can/does the front driveshaft spin in 2H range that could cause the vibration very similar to a tire out of balance? The front driveshaft is original and has not been serviced other that grease. Very minimal play in the joints. I have the original auto hubs that require you to backup 10feet or so to make sure they unlock.
thank you for your time to reply.