I need help with the codes PO700 and PO750 ?

 

First of all you may get more help if you post in the correct forum. This is 1st Gen and you need 3rd Gen.

https://dodgeforum.com/forum/3rd-gen-ram-65/

You have a low reverse circuit code, and the most likely cause is the shift solenoid which is also called a solenoid pack.

Below is a tranny recall for your vehicle just for your info.

http://www.AboutAutomobile.com/TSB/2...+Unit+and+Line