if the wheels are moving in and out during travel its bumpsteer.The wheels can do the same thing,they can be one towed in and the other toed out or any combo.You can do alot to fix the problem by reading the old mopar chassis book.You can shim the steering box,you can relocate the idler arm by grinding the mount and welding a washer to the frame to hold the idler arm.I got my car down to a 1\8" tow-in.Its easy to fix,but hard to understand.I read the chapter on bumpsteer several times before i understood it.You can fix it good luck!