Worn out yolk?

Dont notice any engine vibration while revng in nuetral . Wish I could say the same for idle ...lol

I have run several different rear ratios . Still has throbbing vibration in 3rd around 3200 rpm.
Entirely possible that Jim my driveline guy got the balance wrong but I had him check it out again a few months ago . Thats when he shimmed to correct pinion angle and installed new tail housing bushing .