My continuing saga... OK, so I put on new tires. That did help quite a bit, but still have a little shake 30-32. I wanted to test more caster so went from 4 degrees to 6. That made it more like what it was with the old tires giving the shakes 30-35. I've changed about everything so stock specs are just a suggestion.
To recap, here is what I have:
215 65R15s, 6 1/2" rims, 1951 front axle, mono-leaf spring, front sway bar, 47-55 style front shocks.
Would the age of the rear tires cause this? It does feel like it is coming from the front vs rear.
Dennis
Dennis - Did you only replace the front tires? Old rear tires could have an effect if they are the same age/condition as the old front tires. A tire imbalance or out of round issue in the rear could (perhaps) telegraph the vibration through the entire truck. Makes it hard to pin point where the vibration originates from. Just from a safety stand point, I would recommend the rear tires get replaced if they are the same age as the old front ones.
2ManyTrucks mentioned in his reply above about possible shock issues. How old are your shocks? Have you done a bounce test (by hand) on each corner? Checked that all the shock insulators are all present and snug?
Just a few thoughts to consider in further hopes you can resolve your vibration issue.
