Transmission code 42 and 63 check engine light code 43

Hey everyone, so I was looking for a little help with my 92 4Runner 3.0 L 4x4. I’m throwing transmission code 42 and 62. 43 is defective speed sensor or severed, harness or wiring. I just replaced my speed sensor, ( genuine Toyota part ) so what is my next step be to get a new wire harness for it? Then, as far as the 62 code number 2 solenoid it’s either severed, wire, wire harness or short circuit. Do I just replace my solenoid and wire harness at the same time? I am getting ready to drain and fill the transmission fluid so probably be a great time to do that. And thirdly, check engine lights, giving me at 43 code,my starter circuit signal. I’m really not too sure what to do about that one. A little direction would be greatly appreciated. I know my ignition switch is a bit worn when I put my key in I have to kinda fart with it to get in the right position for it to turn to the on position. Anyways, I hope all that makes sense lol Thanks again for any help!

 

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