Attn Cobrajet-
My clunk was not the tranny...it was the driveshaft splines binding. Apparently the grease was working less then it was supposed too and the tolerances which are spec'd very tight were to tight. Therefore they were binding, and I got that god awful clunk, post braking which drove me nutz-
Ask for an A-Z look at the driveshaft. You should also find my last post immiediatly following my service with the diagnosis. I brought in a couple copied emails from the Forum and it seemed to help my Master Mechanic get it isolated and fixed. Tranny works killer now, and I'm going to that autotrans Interceptor to make better use of it.
Good luck an holler at me if you need any other insight-
peace