Like the title says. How fast are you comfortable cruisin' at in your K5? I top out at about 70 before The shakes start to drive me crazy. I'm trying to see how normal this is and if I need to start hunting some driveline problems. BTW - My K5 is bone stock suspension wise and I'm runnin' 31's for Christ's Sake. I should be comfortable running fast than this on the Interstate at least.