I did all the work myself, except for the rear diff, as I couldn't justify the money for the diff tools for a one time thing. As for the friction modifier, not a clue at what happened there as I wasn't there when they worked on it.Im pretty sure that dealer was milking you like holstein.
Both wheel bearings failed at the same time? Weird!
Rebuilt entire front end because of a bad ball joint?
Two sets of Ls clutches in less than 100k.
I would bet money they didn't add enough friction modifier.
I think you should be pissed at the dealer.
To me it sounds like you had bad luck with your truck and a shop that was upselling you and doing work that they know will work past your repair warranty but will inevitably fail.