[5speeds]

The Jag rear is a Dana 44 and no machining is required. I was at the track last week and saw people in stangs hitting the G-orce transmissions with at least 600HP. However just because it survives a blast or two, shouldn't mean it is a stable rating. That is the problem with ratings in general. The lower you go (numerically ) with the axle gear, the higher the torque is shifted towards the transmission.

Personally when we set up a gearbox, it is all new. The potential problem is people retrofitting gears in stretched out cases, or not knowing enough about blue printing the T5. This can lead to variables in terms of some transmissions surviving while others don't
--Paul--