welcome to the club :waving:
first off its a dana 30 not a 35 .
and gears area ll about preference. ive never played with them yet but most people agree with 4:10s being just right for 31s. so you might be geared abit high. but revving 3000 at 75 isnt tooooo bad. and you seem to be getting half decent gas milage so idk if youd want to change them or not. if you do keep them incase you ever need/want to go to bigger tires.
someone else will chime in with more info as I'm just spitting out what ive learned from reading here .