I have bought from both tim and suspension source. Never had a problem with either one. And another vote for a 3/6 over a 3/5. 3/6 will set up a bit quicker and you dont have to deal with hangers and shackles or installing a flip and then installing lift hangers or finding some lift shackles, Its just all around much easier and cheaper to just go ahead and do a 3/6 with 2" spindles, 1" spings and a flip kit. Of course you will need to notch for anything lower than 4" in the rear and although you dont need helperbags, it will ride better and if you haul or tow anything it will help you out. It really just depends on how you use the truck. I was at around 9" drop in the rear with no helper bags but never do i haul anything or tow either and bottomed out, but never really found out if it was the pumpkin on the bed support, the shock, or the notch.