Braking doesn't seem to help but keeping the throttle open slightly does almost eliminate the vibration. Havn't had time to check anything yet. Thanks for replys.Prolly the u-joint, or the shaft splines get some play in them. It happens from a higher speed when the U-joint is in a no load situation. a bit of brake or a bit of throttle eliminates the vibrations. If when slowing down instead of shutting the trottle completely , keep the throttle just bit open to some torque on the shaft and the u-joint.d see if the vibrations mostly goes away.
GM, When you mention the pivot bolt locknut tool, are you referring to the swing arm? If so, the universal joint and boot can be changed without removing the right side swing arm bolt. BTDT.You may be right on thinking it is the u-joint. The symtoms of a failing u joint can be just as you describe. To check it carefully pull back the rubber boot at the right rear of the engine ( Be careful not to tear it) rotate the rear wheel both in and out of gear and check for looseness or any other adverse movement in the ujoint. It is not really difficult to change the ujoint on a 1500, if that is, in fact ,the problem,but you do need a pivot bolt locknut tool so that it can be retorqued properly..........GM
