szki272: You are right. The stock setup isn't even technically correct, and for the reasons you state, it really can't be. I have my pinion tilted up about 5 degrees (to get the castor right) and I get vibes at a lot lower speeds. Nothing on mine is stock except the t-case though. I have just seen too many guys angle up the pinion for a "better angle" (when it technically speaking is a worse angle for a std driveshaft) and then find they have driveshaft vibration and death wobble up the wazoo. Unless you want to cut and rotate the knuclkes and get a front CV driveshaft, you are forced to compromise between castor angle, pinion clearance, and driveshaft vibration. For me, I rate their importance in that order. But depending on what you use your rig for, you might have a difference list of priorities.