My Tremec 3350 has been in my 3200 pound 65 Mustang fastback since around 1996, behind a 331 stroker, approx. 425+ hp and torque.........over 200 drag strip passes running drag radials, 2,000+ miles on 4 different road courses so far and 35,000 street miles......
so far no problems, and I have changed the fluid in it twice.........
david