You got some good info with that much slack at the pinion I would have to remove the diff rear cover for a look. Removal of the drive shaft and cover for inspection is not difficult but may require a good trained experienced eye to locate the issue.
I associate slip yoke issues with a bump once the truck starts to roll the yoke binds up and pops.
Your issue is a common issue I googled it lots of info I was going to recommend GM #12345879 Special Lubrication on the slip yoke but ran across this TSB.
I googled "GM #12345879 Special Lubrication". Its expensive for a one time use and its eliminated some of those issues BUT they always came back in time. The price shocked me but the can has done a many slip yoke for me. I would guess I have lubed 50 are more with one can. I can not recommend any one fix I would be looking at the differential worn carrier/spider gear set ups are not that uncommon on a GM... Even if it were a U-joint issue it would not be a guess you would know a bad joint once the shaft was out.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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