ever since i put in my gears about 2 years ago, i have this harshpulsating vibration at about 90mph and it kinda stops at about 110 if i remember correctly. Its basically hitting a harmonic vibration around that speed and its annoying and sounds like its not too good for the driveline. its definately the rear. so i would think automatically its the gears, but im not sure wether it started exactly when i did the gears or what so what do you guys think. bad gears (used fms 3.73's off ebay), bad diff bearings? bad driveshaft?, bent axle? anyone have this same condition?. i bought a whole new diff install kit and im picking up some 3.08's tomorrow and i guess ill check the axles while they are out and see if they are bent. anyone?