Shaking rear end

movietvet · Jul 1, 2024

AT 71, I don't take on all jobs. Just what I choose to do. I set the rate, period. I also help out at a shop my friend owns. Since I am retired, I choose when I work. Has worked out for 27 months now.

jakeboyce33 · Jul 12, 2024

GoToGuy said:
If you swapped the wheels around, and it's not brake issue, if you have shock adsorber that's lost it's oil , you can hit a bump and the wheel/ tire will start a cyclic bounce ( shaking ) as the spring and tire will act like a bouncing basketball. Have checked shocks? How old ?

I replaced my shocks last weekend with AC Delco Golds. Had my two rear tires rebalanced and the bouncing actually got worse. That's actually with the new shocks in it too.

GoToGuy · Jul 12, 2024

Is it actually bouncing or is it a vibration? Could someone video it at the speed it occurs to the most noticable?

scott2093 · Jul 12, 2024

Guess maybe it's time to look at the springs? Shackles?.. :think:

Road Trip · Jul 12, 2024

jakeboyce33 said:
I replaced my shocks last weekend with AC Delco Golds. Had my two rear tires rebalanced and the bouncing actually got worse. That's actually with the new shocks in it too.

That's not surprising. By replacing the shocks you effectively change the resonant frequency of the overall assembly, and you
end up with a tighter coupling between the sprung vs unsprung weight, and what you feel is now worse than when you started?

Maybe I missed it, but have you done any investigative work on your driveshaft as of yet? This is reply #25, and I counted at
least 11 replies before this one that outlined all the different ways that the driveshaft could be causing this vibration? It can
be out of balance, bent, twisted, bad carrier bearing, wonky u-joint, etc. I'll bet that if you added up all the experience in those
11 replies that there's well over a 100 man-years worth of vibration analysis/repair.

The bottom line is that these trucks have enough engineering in them that they can & do run super smooth down the highway,
but only when all the parts involved are running within factory tolerances. Take that driveshaft out and to a dedicated driveshaft
shop where they can find and fix any/all the different ways that they go wrong. Looking forward to your next update.

Shaking rear end

movietvet

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jakeboyce33

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GoToGuy

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scott2093

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Road Trip

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