If the black one is an auto you best pull it and have it upgraded.... Even the smallest of power adders will drive right through that stock converter. Towing your heavy azz 32 foot trailer will bring that truck to it's knees in stock form. been there....done that.... still driving my 01. Over 100K on my trans that I built with Dave G's help and parts. Chip, injectors.....finally helped it get out of it's own way.