In doing some research, I stumbled across another transmission warranty that may be of interest to you:
The Automatic Transmission Rebuilders Association (ATRA)
"Golden Rule Warrany"Quick summary:
1900 independent shops nationwide in USA
and Canada.
12, 24 and 36 month warranties available.
If it breaks within the warranty, take it to any nearby ATRA shop and they'll fix it for you, and the bill goes to the original shop that rebuilt it.
One other option to look at is ATK / VEGE. Their warranty is
here.