Vibrations at load!

Pull-n-TugTx

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Been reading around and wondered what ya'll think. So I get a heavy vibration under the seats when Im holding speed on letting of the pedal to change speed. If Im all the way off the pedal vibrations stops instantly no matter the speed.

So, Im thinking U-Joints and Carrier Baring! I just read somewhere that the Carrier Barring needs to be dropped a 1/4" for every 1" of lift. I think the truck has a 2.5 or 3" on it. It is the FX4 pkg so I'm not sure.

I have a video, from in the cab, of whats going on not sure that it translates.

Does any of this make sense to anybody here, need HELP!! Gotta road trip planned for Turkey Day!
 

79jasper

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Could need greasing. Think there's a "more technical" fix for it.
Start with checking u joints and the carrier bearing.
I'll try to find the info I saw on the slip joint.

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Pull-n-TugTx

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Crawled under there this morning. Found the Carrier Bearing rubber is shot. Lots of free movement in at the Carrier and grease spun all over around it. So thats where I'm going to start.
 
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