I'm sure some of yall have run into this before, but this is by far the most powerful truck I've ever owned so here goes.

For probably the past year, every time I'm playing around and put too much power to the back wheels, the truck starts to fight in the rear end as if one wheel is trying to outrun the other.

This results in an extreme sway back and forth.

I had some heavy towing to do last week (broken down Duramax (not mine)) picture included, and while climbing hwy 25 and the Saluda Grade, the truck would start to sway so bad you would think I was gonna lose the gooseneck.

The only way to stop the swaying is to let off the throttle.

Everything looks intact underneath.

Any suggestions?

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