I am the new owner of a 14sf for my blazer (yay) and I was searching around and found this on summit. I wanted to see what you guys think about it or if i should go a different route. My thinking is that I dont want to mess with the carrier as to avoid messing with shims, wear pattern etc. and I dont do much rock crawling, mostly mud. The description looks impressive, but I wanted opinions before I shelled out 430 bucks. http://store.summitracing.com/largeimage.asp?part=PWT-92-0795-3305 "The Powertrax No-Slip Traction Systems are the latest design in traction-adding differential technology. They combine the smooth operation of a limited-slip differential with the traction performance of a locking differential. A precise synchronization mechanism eliminates the ratcheting sounds typical of other locking differentials. Special gear and spring designs reduce the backlash, and, therefore, the driveline windup. Only ultra-strength material that is 67 percent stronger than titanium is used. Installation is simple because no ring and pinion setup is required. In addition, no special tools or oils are needed. Step-by-step, model-specific instructions are provided with every kit. "