I did not do the work myself, but I trust that the mechanic I used installed what he was supposed to. He owns his own speed shop and prefers working on F-bodies and Mustangs. I already took it back to him, and he heard the noise. He told me to try adjusting the firewall adjuster. He also said that TOB noise is typical with these transmissions (I have a TR3650), as well as the 3550 and T-5.
He said he would install another new TOB (not for free, of course), but suspected that I would just be back to see him in another month or two again with the same problem. That's why I'm just looking for a reputable, almost surefire way of fixing this problem. Do you think it might actually be the use of an aftermarket clutch that is the problem (I have McLeod, which is good), or the use of a particular brand of throwout bearing, or is this just a design issue that can't really be permanently fixed?
Guess I'll have to get headers and an O/R h-pipe to mask the sound