So thanks to liveoak I now know what it is that has caused my truck to never drive as smooth as it should. When doing my e-locker retrofits this summer I hooked up a obd2 scanner to my truck to see if it was showing any codes (despite the fact that my check engine light was not on) and found I had a vehicle speed sensor error. I figured it was normal and caused by the fact that my engine was out of an automatic yet was using a ECM out of a manual. Well come to find out that not having your vehicle speed sensor hooked up causes poor gas mileage (check) a rough de-accleration (check), as well as some other issues. LO tells me that it is an easy fix of simply splicing into my cluster's harness with the proper wire running from the ECM. So I'm going to take off my passenger kick panel and see what I find and go from there.