Don't guess! I've become very good at re-&-re'ing the different shims by doing that! An education by default! Lol! There is a method to measure you're pinion angle. It involves a tool that I don't have, & I would think that you don't either! It looks like a flat circle with a needle in it that points down to indicate the angle of the pinion. Kinda looks like a compass. It attaches to the rear end housing at the pinion snout by a magnet. The vehicle MUST be on a totally flat & level surface to do the measurement. Rear end or suspension shops would be the best place to have this done. Takes just a few minutes. Shouldn't cost much, if anything, to have the angle measured. The shop can then tell you which shims are required as indicated by the reading of that gauge. Because you have a flip kit, to lower the front of the pinion down, the shims will have the taper going from thin at the front to thick at the rear. My '98, with a DJM flip-kit, had no issues with this, as apparently that kit has the pinion angle compensated for within the design of the kit. Although, that truck is a SCSB with a one piece driveshaft, and no center carrier bearing. Now, my blue truck with a 2/4 drop was a whole different story! Don't get me going about that exercise in futility! Lol!