This noise actually started when the truck's transfer case was rebuilt
(but only a needle bearing replaced), the front drive shaft replaced,
and the lower (I think) ball bearings replaced. Tires rotated, oil change.
I blew it off as new noise due to new parts, but since it's gotten
worse, I no longer think that's the case.
It's definitely something going with whatever parts turn with the
wheels. Most pronounced when turning right, it's a
whumpa-whumpa-whumpa, same rhythm as a rock in the tread might make, and
similar to the sound I've heard large-tread 4x4 truck tires make -
except I've had these tires for a couple of years and they never made
the noise until now.
When truck is first moving forward from a cold start, can hear the noise
on the straight, gradually fades, but I think there's a high whine that
wasn't there before.
Has made the noise turning left too, but definitely more pronounced
turning right, even if it's a gradual turn.
So, what are we looking at this time?