Clunk noise when shifting upwards

I wouldn't even know where to look at this point. This car is a learning curve for me. I'm tackling the problems head on and hopefully by the fall I can start to sort out and plan the conversion 440/727/8.75 but until then I'd like to keep driving it reliably possibly into next summer if I'm hit with delays. I sure do get a lot of comments though on the street.

Posted via Topify using iPhone/iPad