Personnaly i wold go with a supercharger extremly hevy power and torq its good for offroading racing towing and many other uses. personally i would go with and 8-71 its very powerful and is still streetable. once installd in your truck you should get much more power and torq but thay are fairly costly and can cause your tranny and gearbox to go into meltdown if you dont pay attintion to them to. if you endup with a supercharger i recomend getting autometer indash gauges to keep your trucks heat and pressure in good numbers. hope this helps good luck