It is very common that you can't tell a bad Ujoint by hand. Often times you can't tell with all four wheel off the ground and motor running, etc because there is no "load". Most of the time you can hear the general area of the noise. If you don't find anything wrong, it's the Ujoints. Maybe the carrier bearing too. If you replace them, make sure you know what "phasing" means.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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