its almost going to be impossible to get this right on the first try. Even if you copy the springs exactly as someone else who had already done a ruf (and what ever springs in the rear) swap. you springs have had different loads and use than their springs have. so they for ovious reasone sit different. its all trial and error here. and may take a few time to get the truck to sit right.
What i suggest is if you have a rear pack in mind. do your rear swap first. then build your ruf packs to match. when you add springs stagger the legnths down in legnth from the longest being the main.
hope this helps
