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I have an 03 Z71 with 106k miles. I've owned it since it had 20k. I've had a lot of the issues you describe.

The shift cable issue I had after I loaded the back full of firewood (bump stops touching the axle) then drove it out of a winding trail. Torquing and twisting the truck. Long story short there is a plastic sleeve the gives the shift cable support at the trans shift linkage. The plastic sleeve was broke. The shift cable has a factory splice on the lower side of the cab. So I bought a whole cable but only replaced the lower half.

Had a '96 chevy 1500 and did a similar thing.