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Message: <blockquote data-quote="CineSLR" data-source="post: 146291" data-attributes="member: 1195">IMHO,Your better off doing the perch adjustment than using a spacer if your going up to 37s.  Not only will it keep the suspension stock (less of a leg for a dealer to stand on if something were to go wrong up front) but it would stiffen things up just a hair which will help deal with all the extra weight of the 37s.  Rumor has it, the middle perch setting is the setting Ford wanted to go with but due to bumper height requirements, they had to release it at the lowest setting.  Its not like your building a rock crawler here that needs to be as soft as humanly possible and custom springs are not an option.  That is really the only time would ever consider using a spacer.Any chance you could figure out what those magic offsets are?  I'm sure many here that want to go up to 37s would appreciate it!As for your HP claims, either your tuner is lying to you, or they did more to your truck than they said.  There is no way you gained 130hp with just a tune and exahust.  Are you S/C'd?</blockquote>