Okay, I took a trip down to Dallas Tx yesterday, and found a issue with my van, the 91 B-250, that has me somewhat stumped.
At about 60mph it develops a high pitched viberation that you feel in your feet and seat of the pants, and it goes away after you hit 73-75 mph. I checked the U-Joints, both feel tight, no slop, wiggle, or the like in them. The trans mount did not show signs of slop when I lifted on ithe trans with the jack, and the motor does not torque over showing signs of a bad motor mount . . . . . Did I miss something ? At or above 75 mph, smooth as a van should be at that speed, so I am not sure where to look next.
H E L P !
