I'm definitely no expert, but pushing a lot of torque on the overdrive gears, gears that are not built to handle the abuse the first few get, they may not hold up very well. My shop was hesitant to run my dyno's in 5th because they didn't want to put that extra wear on the gear. Again, I have no direct experience with the failure of the gears.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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