i had a similar problem when we had our last ice storm. look in the cowl panel out side the truck. i had a chunk of ice on the crank of the wiper motor. it would not move until i grabbed the wiper and started pushing it manually. then it would only move slow. after seeing what the problem was i just got some warm water and dumped it in the cowl and once the ice started to melt, the wipers started working again.
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GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd
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