Mine lasted for close to 170,000 miles, about 50,000 of those with 350 or so flywheel hp. It never died even with tons of abuse I dished out on it. When your dies get a lentech rebild kit and then don't worry about it. And to answer your question the aod can handle about 450 hp stock. The limiting factor is the hollow 2 piece input shaft.
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1990 5.0 lx aod
no power adder
best 60 ft: 2.05
best 1/8th mile: 8.84
best mph: 83.07
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