Did one of the balance weights fall off either end of the shaft?
Have you felt around the treads of the tires for bulges?
About all I can think of right now..
Goood luck....
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'68 C-10 '72 Blazer,
*** 4,000 posts and counting, and 1 year anniversary, on this forum.
Looking for any info on anyone who has a 50th anniversary 1968 truck !!
r72k5@hotmail.com