oldmacktrucks Posted October 28, 2010 Share Posted October 28, 2010 Turned out to be a loose yoke behind my air-shift 6 speed, only did it between 50 and 60 with no load on the driveshaft, yoke was worn...put a new yoke, bolt and washer and she is as good as new. Hope this helps anyone trying to narrow down the cause of a driveline vibration issue. Quote Link to comment https://www.bigmacktrucks.com/topic/16294-driveline-vibration/ Share on other sites More sharing options...
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