Thanks for the reply. I find it only happens when the truck is moving. It
happened once when I picked up my son from school, I was parked, started
the truck moved up about 10 feet and it clunked twice. Then it didn't
happen again until the next day. It may clunk a few times and then stop,
and then not happen again until sometime the next day. Last night it
clunked about 6 times, so I slowed down and it did it again another 3-4,
so I put it in neutral and coasted as far as I could. When I put it back
into drive, I made it home with no more noise except when I parked it, I
popped the hood and noticed the squealing noise coming from the pullies in
the front of the motor. I'm just praying it's not in the transmission.
Wouldn't it be a more consistent noise if a gear was damaged? Other than
that, it shifts and runs just fine. Sorry for the long post, but I have no
clue. Thanks again Stormin Mormon.