tuckinuts
+1y
If you're talking about the length of the end links themselves.... On a static dropped truck ... Disconnect the sway bar, and with the vehicle on the ground, get the sway bar set as flat and level as possible then measure between it and the control arm. If you're using something like an energy suspension kit, they make different length end links.
Now on tightening them up..... I use a dab of poly urethane grease ( or Vaseline ) between the top and bottom surface of the sway bar. And tighten until the sides of the bushing just starts, and I mean just starts, to swell. This way there not over tightened. Drive it a couple day a check them to see if they've loosened.
Hope this helps
Darrell