Don't hold a gun to my head, 'cause I've been away from GM for a number of years now.
However, I'm pretty darned sure those two outfits are identical except for that electric operated/fluid clutched transfer case in the Olds.
As for your whine: If it is in one direction only, that is to say, it whines more on deacceleration and kinda shuts up while pulling steady OR VISA-VERSA, it's coming from the ring gear and pinion.
In other words, a ring gear and pinion noise will "change pitch" with differing driving modes.
If the noise is there continually, no matter what and at the same pitch all the darned time, I'd sure suspect those inner carrier bearings. They also go at around 200K miles.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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