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I just wanted to add an update to the power holding ability of a st185 tranny/tcase in 2wd mode. We finally broke it @ the 500 hp level. There is a small collar that moves when you select 2wd or 4wd mode. in 2wd mode that collar has to hold one side of the front Diff stationary to transmit 100% power to the front wheels. We twisted it apart. But the car did make many runs at the 400 hp level without a problem, and that collar had tons of miles on it. The new one may be plenty capable of holding the power but I wouldn't want to bet an engine removal on it. So High HP all-tracs are dyno'd in 4wd mode only, around here.
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