My 66 Mustang has got 20,000 miles on a T5z behind a Roush 342 stroker - 480hp/450 torque and I've had no problems to date. I think you'll likely be ok with the T5. I've done track days and drag racing with my car and agree the TKO is far stronger, but so far with gentle shifting on the T5z I've been ok.
Last edited by kiwigt; 12-20-2015 at 10:00 PM.
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