My father has a 1998 Explorer, the rear axle howls and he says it's getting worse and
he's afraid to drive it long distances anymore (which I can understand).

He says this axle is fairly rare - 4.10 gears, 16" wheels, disc brakes with ABS, etc. but
no limited slip.

The tag seems to say:

S616B
4.10 88 8C27

He's pretty convinced it's something in the ring & pinion area - a bearing and/or the pinion
is in the ring *****-nilly.

So, with that, can anybody here point me to a known-good rebuilder along the front
range (Denver metro area referred but FC to COS would work)?

-chris