You should start a thread for your truck.
With that type of shock, I fill it about 80%, I cycle the shaft and twist it around while pulling the shock shaft back out. Then I let them sit for a minute while I work on the next one. Then I top them off.
Depending on the oil weight will depend on how long I let them sit. Usually half an hour or two, depending. I just go do something else for a while.
You'll notice the bubbles suspended in the oil will rise and work their way out. I ensure their are no bubbles before I put the cap on a few threads. Then I move the shock shaft into the body. Depending on what I am trying to tune will depend on what I am looking for. In a crawler I want a "dead shock" so no rebound.
When you have the shock 50-65% compressed and you tighten the cap down ensure you have some oil coming out and you DO NOT extend the shaft until the cap is COMPLETELY tightened down or IT WILL pull in air.
If the shock has some rebound I get it back to 50 or 65% compression, crack the cap and compress the shock letting some oil out. Check it again. Repeat until you have zero rebound.
If the seals are good and you took your time there should be no air in them.
Having a shock stand helps tremendously with this process, but patience is really the key to doing it right.
Good luck!
