[AT] OT truck tires/driveshaft?

[jtchall at nc.rr.com]

Was so sure it was/is a tire issue we only did a slight check on the 
driveshaft yesterday. The truck does not have a 2 speed rear. Haven't tried 
greasing it to see if it helps, it shouldn't be dry no more than the truck 
is driven considering how often I grease it. Still doesn't mean something 
isn't trying to lock up, worth greasing to see if it helps.
The center driveshaft hangar was replaced a 4 or 5 years ago, not many miles 
on it and it still looked good yesterday. I did notice a little slop on the 
driveshaft spline, I would think a little is acceptable on a machine of this 
age?
Haven't tried pushing the clutch in once the vibration starts.
I tried a pry bar under the tires on one side while it was jacked up, didn't 
notice any slop. I will say things are a tad noisy when you jack one side of 
the truck up and put it in gear. Sounds loudest around back, normal? Didn't 
really give it any gas when we were checking. You don't hear any strange 
noise in the cab while on the road, then again it's not very quiet in there 
to start with.

John