Clunk noise on the 1/2 shift in an A999 trans.

I'm familiar with the clunk when letting off the gas at the wrong time. This is not that. It is when steadily accelerating from a stop. I will say that I have been driving it a little and it's getting better. I still need to pull the pan and look around. I'll look at the accumulator and spring now that I know about it. Is there anything else I should look for? Obviously I'll look for filings and friction material in the pan and valve body but I'm scared to do too much in the valvebody cause I have been having a recurring nightmare about springs and checkballs flying out of it and never being found again. :)

The clunk may be a combination of shift overlap and the rear end play.
If it binds at all on the 1-2 shift the trans will try to stop the driveline and then the shift will slam it forward again causing the play to be taken back up and the clunk.
Try backing the front band off 1/2 turn and see what it does.
That will give it a second longer for 1st to let go before second applies.

Just a thought.