Basically, when you install drop spindles, the shaft your bearings ride on is located 2" higher than stock. When doing this, the center of your wheel is 2" closer to your upper control arm, and 2" further away from your lower. Nothing else changes. Your best bet is to get under your truck and measure your clearance between your wheel and your lower control arm. Keep in mind, you may have turning issues with a 15" wheel. A buddy of mine has 15s on a s10 that is bagged with drop spindles, and his wheel rubs his lower control arm at full turn. Granted, you don't have an s10, I was just using that as an example.