Originally Posted by jebmccall
transmission mount is new, and that issue sounds different than mine, but i appreciate you posting that.
check the engine mounts as well. when under a load then engine can move around and make a popping/ clunking if the mounts are worn out.
Also check your exhaust manifold for cracks or loose bolts. I know you said it sounds like its coming from the drivers side but its worth a check...
if its neither of those.... I'll have to do some research