Thanks Rob, appreciate the info mate. I run a Tremac behind my Aussie Ford without any problems. It's a TR3650 model trans. The Ford makes 540rwnm @ 1,500rpm and 700rwnm @ 4,400rpm. Also makes 310rwhp in stock form apart from tuner and exhaust system without any problems at all. You can see more about it here:
http://www.nz440rt.com/TS50mods.html (Dyno sheets etc). Also, Greenfish the member here gives his Keisler absolute death without any problems, this is track and street driving. I'm beginning to think there are good and bad stories out there with the Tremac transmissions.
If it does decided to eat itself I'll probably look at what XV have, a Viper T56 trans. They said you can shift it at WOT @ 7,000rpm+ and it's built to handle up to 1,200rpm. They have the mount for the pistol grip too.