if you want a stall get one, but youre in a 4 door lifted 4x4, taking off is never gonna be your strong point, im usually all about doing the small mods first but seems to me you need more POWA!!!! id be looking into cam kits, possibly an SC or turbo if i was you. Then agian i drive a lowered short wide with nitrouslike you said you drive highway alot, turbo or sc is gonna help you out more i would think or doing just a cam with a good mid-high range.