Does your vehicle has a torsion style front end anti-sway bar? If so, check for worn bushings ( or just plain dry) at the points where the bar is fastened to the frame. The bar flexs in one direction when turning left, then the oposite way when turning right. Thus, usually only one of the bushings will "pop" at a time, giving the alternate turning effect thunk. I once replaced my rubber bushings with high performance "poly" bushings. The poly bushings snaped and poped and the noise was amplified through the frame. I went back to rubber. ttt

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