I took the car out this morning to fine tune the timing and on one hard acceleration the transmission did a pretty hard up shift at about 40 mph. There was a sharp metallic clang from the transmission.
The car drove fine afterwards, but I only took it a few hundred yards.
Should I be concerned? Is there something benign that would cause this?

 

Any thoughts on this? Anything I should check out next time I back in the US?

 

how long did it sit the clank may have been the drive shaft or possible loose trans mount which you would be amazed how easy they get loose. And the trans hard shifting could have been a pressure problem where something was gunked up and got free up after so much pressure.

 

Not long, and I had just returned from a 20 mile cruise, so I think things were fairly well warmed up.

 

if something gave out. The first sign would be in the trans pan. if you suspect internal damage drop the pan and inspect.

 

OK - will do that in June when I get back.

Thanks.