There is no way to say this politly so here goes .
Unless your aim is really good ( meaning lucky ) Tossing parts at it isn't going to fix anything.

You already have a code, perform diagnostics on said code and see where it takes you.
There is a trans relay but it's location varies with year , and I dont have the manual in front of me to say for sure where it's at


ps . I just ck'd P0700 is not a valid code .This is from dealer connect - mopars tech assistance website

Quote:

---

Your search - P0700 - did not match any Service Bulletin documents

Your search - P0700 - did not match any Service Information documents

Your search - P0700 - did not match any Star Online documents