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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