Steering box adjustment

It’s not listed

now I wonder if I should buy new box instead...

I'm not an expert, but if you can't find a 65 or 66 dart manual, the steering gear should be the same.

You may not need a new gear box. And I heard nothing but terrible things about remanufactured Cardone and others. If you do decide to get a new one, pay the price for a Steer and Gear or Firm Feel box.

Keep in mind, these steering systems are old technology and feel much different than our new cars we drive nowadays! It may be that you just haven't driven one in a while.

**** Edit ****. I just re-read your original post and see it is manual steering. Forget most of what I said, lol..

Download a 65 or 66 manual and see if the steering section looks like your gear. Then follow adjustment procedures.