Check for up and down play in the ball joints when the wheels are on the ground with a suitable bar that is strong enough. There should be no movement at all.
Remove the driveshaft and make sure the u-joints are not stiff. IF there is a carrier bearing on that one, make sure the webbing is not deteriorated.
Make sure the power steering has no air trapped in it. Sometimes evident by air bubbles in the fluid.
Try engageing the 4 wheel drive and see if it stops the vibration when it happens. OR drive it in 4 wheel drive to see if it no longer happens.
As stupid as this sounds check the tire size and match it with the sticker on the door jamb to make sure the tires are correct. Then chack all four tires to make sure they are the same.
Try getting a pair of 1 degree shims and just slightly change the driveline angle. The shim goes between the spring and rear axle housing
Saturday, September 19th, 2009 AT 7:13 AM