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Check in the fender wells and on all mud flaps.. also check the front plastic valence for any signs of rubbing... Sounds like your tires are rubbing something... I agree with above post.... With 37" tires.. even with a 6" lift you may still be rubbing on something when you're turning and the suspension is all torked up... Have a look for rub marks ! JMO !
I agree on it possibly being the tires rubbing......either the inner fender liner, or depending on what wheels you have, they could be catching your leaf springs a little.
Pull the inner fender liner back and zip tie it or screw it back.
If it's the springs, drill and tap the steering stops to install a bolt so that the bolt head hits first, effectively limiting your steering.
I'll be easy to see the line on your springs if it's rubbing there....should be fairly easy to see on the inner fender liner as well if it does it often enough.
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