I own a 06 GMC Sierra Z71 and installed a RCD 6inch lift. The rear I used the blocks along with my stock leaf springs. I have noticed over the last few months that my drivers side rear is sagging about 1.25 inches lower than the rest of the truck ( I measured the gap between the tire and fender well on the entire truck). I have doubled checked everything and can''t figure it out. I haven''t even taken my truck offroad yet, and I can''t get a straight answer out of anyone. Maybe the rear leaf''s need to be replaced?
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Drivers Side Sagging - 
