2011 Silverado Maintenance Questions

[bowserb]

Hi guys, it has been awhile. I just hit 163k today. I am doing new plugs. Same AC Delco OEM's. If I could get 80k out of each set I might as well stick with them. Trans fluid was done at 75k and 125k. Should I do again? Filter and fluid? OEM or go for a mobil 1? I had to replace the power window switch for all 4 windows recently and have what sounds like worn out tie rods up front. I am on all original suspension and feel it is finally getting a little noisy and loose. What are your thoughts? Tie rods I think are causing some noise. Just got an alignment and some new Firestone LE2s that made a big difference but want advice on what I should be looking out for or recommendations on fluid or parts. I just paid her off and would love to do another 75-100k on it before buying new again.