somewhere between saginaw and muncie my arse pal...
it really shows how much experience you've had with these gearboxes..
i currently run both these gearboxes in my cars ...
borg warner super t10 in my L34 452 HP 450 foot pounds of torque as many forum members have seen this particular car of mine they would support the punishment i dish out to this box...
i've also used b/w super t10s behind high powered chev small and big blocks with over 500hp and never broken one..
i also use a muncie m22 rockcrusher in my 69 camaro which makes close to 500hp on the street and have used common muncie boxes to support over 450 horses...
like anything age,wear and fatigue play a big part
i base my trival arguement on well over 30years experience with both gearboxes
the aussie 4speed was designed for a 4 cylinder let alone 6 cylinder and are great for them once you increase the power and torque in v8 form they don't like it..
Super T10 was used by GM once the high torque big blocks were finished and the Muncies were no longer required. The T10 was introduced in the 50's, and GM sold the design to Borg Warner who improved it into the Super T10. A great box and strong but sits somewhere bewteen a Saginaw and a Muncie. In reality a small block box. Good for thing like A9X's.
The Aussie 4spd is a basic scale model copy of a Muncie design. Totally different box but same design with reverse in the extension housing unlike a Saginaw.