Looking at a truck with a 6 spd manual trans. Are these good transmissions? Got to be better then the auto. What size engine does that mean the truck has? I also was wondering what kind of MPG I could expect out of this truck. Its 4x4 long bed quad cab with 3.73 gearing. Anything else to know about these trucks would be great! Truck has less then 100k on the odometer.