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2001 2500HD 8.1L with Allison 1000. Warn M12000 winch with dual batteries. Assisted in the recovery of a jeep that rolled into a deep gully. Hard pulling and amp draw at about 10 degrees side hill-- near level. Truck in park and ebrake fully engaged. Hard pull really put load on system-- ran up RPMs to help recover some juice. At one point winch stopped working due to insufficient power. (Should have used the snatch block.) Winching force actually pulled truck sideways about 4'. While winching also stood on brake pedal and at times it was nearly all the way to floor. Relevant fact: high RPM for about 10 minutes while tranny in Park and T case in 4 low. Ran up RPMs while winching so alternator could generate amps. Heavy amp draw ands stood on brake pedal (to hold position and not get pulled into the deep gully). Eventually got him out and was time to go. Put truck into drive and....nothing. Reverse...nothing. Uh oh. Toggle between 4 low, 4 high and 2 high. Nothing. No sounds, no indication of anything moving. Now the rescue rig needs help. Another vehicle pulled me onto level ground and turned off engine. Let it sit for about 5 minutes pondering what to do so tried again. Upon start up, all is normal and drove home w/o issues. Any explanation why/how a period of high RPM in park will neutralize the tranny? Or did the T-case go into a fit? since only a very slight side hill do not believe it was fluid starved. Thanks, Mark