For those interested, I custom machined some 7.25 degree shims for my K5 with SkyJacker 6" lift springs. This got my rear Ujoint angle to 1 degree (nearly straight)- this is right where I want it (and where it should be for a CV drive shaft). This is in stark contrast to what SkyJacker sells and recommends- I'm going to step out here and say that after talking with SJ at least 3 times- I am convinced that their level one support guys really don't understand what these axle shims are supposed to do. Neither do most Blazer owners I have spoken with. Comments?