Going from 4.5 to 6 is a big leap and more complicated than just the normal spacer/shackle lift gain. You will need a SYE, new brake lines, trac bar, drag link or pitman arm, possible driveshaft, and some other things that I can't think if because it's 2am. Anyway like some of the others are saying, buy the actual kit. If you don't get the kit at least get new coils instead of adding a spacer. A spacer on a long arm set up is just stupid unless it's ACO's. Why are you wanting to go to 6 anyway?
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