Check the tires for roundness. We see more and more tires that are shaped like an egg. And they will balance to all zeros, but at certain speeds will shake a lot. I have a pair of MT DRs that are about as bad as I have seen. They are even worse than the ones they replaced. At 70MPH, they are down right uncomfortable.
Also check the axle flanges for true. There are balancing machines that will measure road force variance , find a shop that has one and let them measure your tires.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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