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    Gear Vendors and one piece driveshaft problem

    Installed new u-joint and vibration almost gone. Changed the rear pinion angle again both up and down 1.5 degrees. Still have same vibration. Don't know where to go now. I am thinking drive line might just be a bad one. Everything I have done to date has not helped at all except the new u-joint...
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    Gear Vendors and one piece driveshaft problem

    Had driveshaft rebalanced at another shop today. Installed it test drive almost smooth. Rotated rear u-joint 180* then bad again. Put it back to original position and rotated front u-joint 180* and almost smooth again. I am thinking maybe bad rear u-joint from new?
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    Gear Vendors and one piece driveshaft problem

    Shaft is brand new. Balanced and rechecked a week later. Thinking about having an aluminium shaft made, but a big gamble at $500.
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    Gear Vendors and one piece driveshaft problem

    The vibration starts a 60. The length is 53" center to center. The angle of transfer case is 5deg down and driveshaft 6deg down and rearend is at 7deg up. I did change the rearend from 5deg up to 0deg with no change. The vibration does get less at 70 to 75 mph.
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    Gear Vendors and one piece driveshaft problem

    Installed a Gear Vendors Overdrive in my 2000 Ford 7.3 crew cab short box 4X4. Installed a one piece driveshaft. I now have a vibration in the drive shaft that I can not get to stop. I changed the pinion angle up 2.5 degrees and also tried 2.5 degrees down, still there. The angles do not seem to...

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