Usually a vibration/shake that occurs only between certain speeds, is caused by out of balance tires. Try rebalancing rear tires.
Geoff
1955 2nd Series 3600 235 cid, 4 sp. - Current 1979 Chevy K10 350 cid 4 sp -Sold 1955 2nd Series Wide Window 283 cid 3 sp - Totaled
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