Update...
It’s easy to do this stuff when you done it just a 2 week before... The calipers were at fault, after replacing both it went in with no problem. A few things, the new rotor (the old one survived the heat) I bought was messed up because of the heat and they could not cut it. Had both older ones cut. And got new brake pads for the back, AutoZone replace them for free (warranty).
I found out I should not listen to Chilton auto books for torques on guide pins, stripped the pin right out. Had to use an older one...Which bring me to a thought, is there a website that gives out right information about what torque everything should be? I listen to the book and said make the caliper guide pins 31 ft/lbs, on top it said everything will be in ft/lbs unless stated different.
Also I did not change the front, to tell you the truth I think someone change the front calipers in this truck before I got it. They don’t look that wore, even though I got the truck 100’000 miles ago. But maybe why the back was wearing so bad because the caliper were messed up bad.