Hello;  My 87 GLdeveloped an annoying vibration from the (seemed like)
right rear.  I was  very busy and couldn't get to it for 3 weeks.  I
expected it to be a wheel bearing, as it felt just like my neighbours car
just before I changed the outer rear wheel bearings.  Finally I had a day
off, I trucked out to my car port tools in hand, ready to do battle.  The
sun fell on the rear left tire outlining the tread separation.  I changed
to the spare, and when I rolled the tire to the front of the van, it veered
all over the car port, the separation was that bad.  Changing to the spare
removed the vibration, I drove to the tire store and ordered another pair
of Yoko 370"s,  They'll be in Wed.        Larry Carter