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When I worked at GM developing lock-up torque converters we beat the heck out of Chevy T350 transmissions. We ran them through a test protocol that included running up and down through the gears continually for 17 hours a day. The engine would hit 4000 RPM at every shift. A single T350 would outlast 4 or 5 700R4s. When you look at how small some of the gears are it's hard to believe they could withstand it. We ran them behind 350 V8s that were fairly bulletproof themselves.
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