<snip>
 We think it's the cv, but we are unsure because the noise occurs when
traveling straight, which is unexpected..
<snip>

When they are bad enough, they'll knock when going straight.

I was on a long trip once where I had to frequently pull over .... crawl
under and grab the axle like a javelin and thrust it back and forth a
time or two in order to drive down the highway without it constantly
knocking.

After I returned home, I pulled the CVs and cleaned 'em up and regreased
'em ... even though the balls and races were obviously worn and pitted.
That bought me some time so I could drive it while waiting for new ones.

Mike
Houlton, Maine