Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice, so feel free to add any additional info at any time.
If it has mismatched parts that will sure throw a wrench to the works, trying to figure out what is going on. If it is swinging too far on both sides of the markings on the gear indicator, and the problem isn’t from wear, I bet you are correct, and you have a parts mismatch. So I would check into that. Something else is these trucks have become so popular that the steering columns have been reproduced, and are available new. They have tilt built in, and that is a nice extra. Expect to pay a little over $300 if you get a good deal on one. I am not sure if that is something that will work into your plans, still it is nice to have options, so I thought I would mention it. I will post a link HERE for a source for a new steering column. Go over all of this and if you have any more questions at all, I am here to help. Good luck with it, have a great day, and Thanks for using Just Answer.
I do not get paid for my work unless you rate at 3 to 5 Smiley Faces or Stars, a bonus is always greatly appreciated. If the answer is not clear, let me know what additional help you need, and I will be happy to assist you further.