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Re: Bought a New GMC
The transfer case is either a Coleman 22 or 42. The 22 is typical 2 wheel, selectable 4 wheel. The 42 is a full time 4 wheel and has differential action between front and rear, the second shift lever on the 42 changes it from differential action to locked. DO NOT RUN a 42 on a dyno with the front wheels on the ground, it'll destroy the transfer case.
Best regards,
T Herder
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