Not sure about the OPs truck, but my Tahoe still has the rear sway bar connected and on stock wheels. Clears 33s fully stuffed well with some mild mild rubbing on the body side of the wheel well liner. Offset wheels or a wheel spacer would fix that but doesn’t bother me.
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what on Earth is stuffed in the back of that Tahoe, that's a lot of weight to do that.
The rear sway bar is only a limiter at max extension (as is the central brake line). The center of the bar comes to within 3/16" or so of the stock rear diff cover.
Likewise keep an eye on the stock track / panard bar, been some anecdotes of their cracking or a lot of rough road / off-roading use. Some longer end links would help in that regard.
I just had all that stuff apart a couple days ago on my Sub, swapping in some new rear coils. Took the opportunity to dismantle everything and thoroughly lube every bushing and flange. Didn't really take a lot of pics this time, it's the third time I've messed with the springs in ~4yrs. Pics in my 'hey vortec guys'/ GMT800 maintenance thread