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It's really common to see an older truck with aftermarket pipes that don't quite look even, that could be something as simple as a pipe hanger/mount, or even an off bend or weld...
As for the unlevel frame, after reading the thread I dont really have any more ideas. You've checked almost everything
Use this method to do suspension methods are report back here with your results.
http://www.sunlitcomet.com/pdf/auto...-Tahoe-Vehicle-Ride-Height-Specifications.pdf
See, I learn new stuff everyday.
I didn't know the space between the top of the rear axle and the bottom of the bump stop is supposed to be ~7".
Sunlit is right. Measure that space on each side. I'll bet that the drivers side space is 1" less than the passenger side, which would show a problem with the drivers spring pack visible or not.
BTW, based on THIS thread, 35.5" high fronts may be the height of the TB's cranked. IE lifted already.