Wow! that's a lottacoin for a couple of hours work.
I have convertors from the 70's that I'm still using, although none were involved in serious meltdowns. Transmission shops used to flush them for a small fee.
The scammer that did my resto here in Victoria had 4 trans shops and a seperate converter shop and charged $1500 min to rebuild a 727 to stock specs add on to that for any HD parts .