You have a number of unrelated problems here and we cannot address multiple issues within one question because it becomes way too confusing to follow. You should ask separate questions for the other issues.

I will try to address the knocking noise here.
You description is rather vague as to where it's coming from but the first thing to check is to see if the can is contacting the shroud, possibly due to a broken motor mount allowing the engine to shift.

Answered by Wrenchtech (expert)
14,729 answers provided

The knocking seems to be coming from under the truck because I can feel it in my feet when it shifts. It will happen sometimes right when I feel it shift into drive. And sometimes I will feel it shift then maybe a second or two delay befor it knocks. And it sounds like someone hitting my drive shaft with a hammer. I hope this is less vague.

Response from Chambo78
2 questions asked

Check the exhaust system and look for a spot where it comes real close to any part of the body or frame and look for any signs of contact.

Answered by Wrenchtech (expert)
14,729 answers provided

Thank you I will check it out and get back to you. Much appreciated.

Response from Chambo78
2 questions asked