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Re: 4 inch drop coils
sway bars front and rear on a truck make a big difference in handling, yes you will need to remove current upper shock mounts on frame to install shock relocator kit, with 4" drop in rear you may or may not need adjustable track arm bar to center rear exactly, only way to know for certain is to install springs with stock bar in place and check to see if rear end is centered exactly, on a 3" spring I've never needed one but with the 4" spring it seems about 50/50 on needing one so I always use the adjustable myself to make sure I'm exactly centered with the 4" rear drop spring.
GMCPaul
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