I may be misunderstanding you, but the truck WILL be in 4wd (and all tires transmitting power to the asphalt) regardless of what you do with the transfer case switch after a 4wd launch.
The rear tires will never push the fronts down the track as the truck will continue to stay in 4wd until you lift at the traps.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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