Allan, I know you used to work on Chevys, but I have to disagree with you on this. I'm pretty certain the Kelsey-Hayes rear wheel ABS system was disabled in 4WD. The info at the link below backs me up with a simple statement: "On trucks with 4WD, the antilock system only works in the two-wheel drive mode."
If you think about it for a second, it would make no sense to leave the system in operation while in four wheel drive. The K-H system has no wheel speed sensors, so it can't tell if a single wheel has locked up. (It uses the speedometer transducer to detect wheel lockup.) It doesn't make much sense to modulate the rear brakes and leave the front brakes engaged when both the front and rear axles are locked together by the transfer case.
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