Get superior 1-2 and 3-4 billet servos. Composite check balls, no. Get a new seperator plate for the valve body if you have over 50k on yours. Transgo SK shift kit, yes. Get new aluminum pistons, yes. Pinless or pinned, depending on the condition of your pin in the bore( if it's wallered out, get the pinless pistons). Mod valve? Don't know about that one.

No, all trucks don't have corvette servos.