mine had the exact same problem. i had to get a new pitman arm,,. i heard they were very weak and most 73-87 trucks today usually need a new one or something. not sure,. but anyways i got a new pitman arm, and at the same time a wheel alignment because with a new pitman arm the steering offset gets even more amplified. anyways you might wanna have that looked at. it costed me $167 for a new pitman arm and wheel alignment.