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is the pulley completely tight?...do your bolts have any shoulder at all..sounds like maybe the bolts are just a little long and not getting totally tight and when the engine runs, there is just enough give to let it flop some.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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