I don't normally post because I feel like I have a hard time putting my thoughts down. I also do not have near the offroad experience as a lot of people on here. What I do have is a background in automotive mechanics and engineering and now work in the natural gas industry which puts a lot of emphasis on fastener safety (I have been to week long courses about proper nut and bolt usage). With what little knowledge I have on the subject I can assure you that Jeep engineers put more thought into using non shouldered bolts into these bushings locations than any home mechanic ever will. A bolt is a "spring" and once torqued to it's design point or stretched it wants to relax back to it's original length, fastening the joint. To get the proper spring tension a lot of engineering goes into bolt design, I'm not sure but believe this is why full threaded bolts are used in these situations. When you use very high grade bots in shorter lengths it's actually harder to get the needed stretch or tension applied. For this reason in the Natural gas industry when fastening down high pressure pipe, vessels, or machinery we don't use the largest diameter, shortest, and highest grade bolt, but instead use several smaller diameter, longer, and the correct grade to give us the most clamping tension. Eddie is 100% right in the fact that the bolt is not designed for sheer, they are not axles and are not the parts that were engineered to accept the side load. The side load is handled by the sleeve and bushing, and is only fastened in place by a properly torqued bolt. When you decide to use shoulder bolts (especially high grade) you are bringing in some unknowns that weren't engineered into the system. These may in fact require a lot more torque to hold tension and not loosen, This could damage the crush sleeve, bushing, heim joint, or whatever else was not designed to be crushed as hard. I'm not saying that these grade 8 "upgrade" bolt kits do not work and solve some peoples issues. More than likely you are just masking the fact of improper torque. I just believe those issues could be solved with the factory bolts, proper torque, and maintenance. A better purchase would be a quality torque wrench.