I have a '96 Yukon GT that has a sway problem when at highway speeds. i just replaced all the shocks and had the steering/front end checked out but it still sways. i have heard of gm trucks doing this, but dont know how to fix it. thinking of buying a sway bar for the rear end. anyone know whats wrong?

yeah man if you dont have a sway bar in the rear it'll be horrible if you change lanes or while you're driving. I put one in my 2wd Tahoe and it works greatit took about 45 mins. and that was mostly drilling in the frame for the mounts on the sway bar. Install a beefy one and you'll be surprised at the difference it makes

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i have heard of gm trucks doing this

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I haven't. Our 2dr Tahoe rides fine with no sway unless it is windy outside. And if it was, my truck sways as well. Check the front sway bar and bushings. The bushings could be squishy and need replacing. You can by a rear sway bar and install it. With such a short wheel base, it hardly seems necessary. My truck doesn't have one either and I considered installing one. But decided to spend my money on a more-bang-for-the-buck mod. Anyway, I can't recall if the Tahoe has a factory rear sway bar.

What kind of shocks did you just install? Check your body mount bushings and see what kind of condition they are in. I replaced the grubby rubber bushings on my truck with some Hyperflex busings. Those rubber things were in rough condition.

Never heard of either. Only thing I notice between my truck and tahoe is the increased surface area of the tahoe sides are more sensitive to wind gusts.