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Message: [QUOTE="Peroni, post: 847364, member: 315"] I've had a driveline vibration for a while now and am chasing my tail trying to find out what is causing it. Starts at approx 35mph and smooths out above 45. Sometimes it's constant, other times it feels more like a throbbing vibration. Worse when cold but never completely goes away when warmed up. Goes away under acceleration but comes back once cruising. You can really feel it when slowing down esp in OD w/ the converter locked. It's at its worst when coasting with a load in the bed in OD. U joints are Precision Super Strength greaseable thru the cap style (all I could get on short notice) that are just over 3yrs old. They get a shot of Schaeffers fully syn grease every 3K. Center bearing was replaced 16 months ago with an SKF unit and the spline was greased at the same time. The blue coating was intact on splines. Rear end was completely rebuilt early last December including new hub bearings. Front wheel bearings replaced in April of 2012. Front end and steering are tight with all parts being under 18 months old. Motor mounts and trans mount are tight as are all the drivetrain bolts. This has been ongoing for about 2yrs now and I really want to get it sorted out. I can't feel any excessive play in anything. Could the driveshaft be out of balance? Its balance weight and weighs are still in place. All parts are clean and rust free. [/QUOTE]

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