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Hello, first post, before I discuss the issues, I've tried my best to look at most of the forum for a solution. I have an 87' Comanche, 2WD automatic, 4.0 inline 6. I was at the gas station, pulled in just fine, got my dranky drank, and when I went to pull out, reverse worked fine, put it into D, and I had no power whatsoever. I pulled my TCU out, and I still had the same issue, I have to manually shift it from 2-1 to D. And when put it in D, it starts off in 3rd, doesn't up or down shift. Reading online, I've seen a couple of things as far replacing the TCU, replacing that TPS, stuff like that. I have a new TCU lined up hopefully, however I just replaced the TPS after diagnosing the last one. When the TPS was relaxed, it was reading 4.8 volts. Switched out the new one, and the open throttle position shows me 4.8V. I guess my first question would be, How do I diagnose the TCU with a multimeter? How do I know if my new TPS was installed correctly? And is my transmission just shot? I've been after this for months, my mechanical knowledge extends to replacing an alternator on my dad's comanche, and an actuator, so I'm learning from scratch here. I'd appreciate any feedback, tips, etc.. Thank you in advance.

So it seems I have the exact opposite problem as most people ive seen online. my reese hitch is rusted. the ball mount is not stuck in, rather it can't be put in. The rusting caused the side walls to swell some. Ive been trying to chip away at the rust with a chisel but it is hard to get down inside the mount hole. Any advice? I took it off the truck so I can work on it better. I'm going to sandblast it and repaint it after.