Clunk from under front, right side
My 1993 Ford Ranger XLT, auto. trans., 3.0 liter V6, developed some time ago a clunk.
It happens in sync with engine vibrations (rocking at idle), usually when started from cold. It is not a rattle. My guess is that part of the exhaust system is hitting the chassis. It goes away after the engine warms.
The problem developed after extensive work on the emissions system, during which the catalytic converter was replaced. All flexible engine mounts (two in front, one under the transmission tail shaft) have also been replaced.
I've crawled underneath but can't see well enough in the confined space to see evidence of interference.
Probably I should take my truck to a shop with a lift and have a more relaxed look.