440 cam question

putting a 440 in my 2002 dodge ram 4x4. does the weight of the truck and tire size affect the size of a stall converter i will need? i am trying to find a cam that will talk to me but i am on a tight budget these days. Summit said teh Comp 270H cam is the biggest cam i can use teh stock converter but he thought i might be able to get away with the 280H cam.
any advice would be appreciated.
Author: 2002ram440