The rear sway bar gives the front end more even weight distribution, hence more traction and less tendency to understeer.
It does that by putting more load on the outside rear tire. To do that requires less weight on the inside tire and a net decrease in the amount of traction available at the rear. And the difference is not a small one. When you find yourself at the limit of available traction and note which end gives up first you'll know what I mean.
Not looking for an argument. Just posting a fair warning about what happens at the limit. I've seen it, and I know the bar caused it. I've slipped around enough on snowy/icy roads to notice the difference.
The Hellwig bar is 1 1/8" diameter. The front is 1". The front end is the heavy end in an unladen truck.
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