Finally got the time to get under there......
Only thing I noticed amiss was a missing bolt that mounts an exhaust pipe bracket to the bottom of the transmission.
Replaced that, but no change.
I'm wondering if it isn't related to the full-time 4-wheel drive.
It sounds/feels almost like a friction clutch releasing and then grabbing, and it only occurs from a HARD acceleration from a dead stop. And it only skips 2-4 times and then is done......
It seems like a bad thing, but nothing ever bad happens, it just "sounds" like the drivetrain is about to break.... :-(

Thanks.

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Barry