Sounds like early warning signs of imminent CV joint failure.

Take your rig to a big parking lot, then drive it in tight circles. If
you have a CV going out, thwe knocking should really be pronounced.

John Rodgers
88 GL Driver

Jesse King wrote:
>
> We really loaded down Shaggy (`82 Westy) for the ride to D.C. on
> Independence Day and he made a hell of a knocking noise after awhile.  He
> began to knock, particularly when I let off the gas.  Now he knocks pretty
> much all of the time.  Definitely tied to wheel speed and not engine noise
> and coming from the right side.  I can't find anything loose or out of
> place.  Any suggestion from the sages on the list?
>
> Jesse
> `82 Shaggy
> `67 Moose