[dodgef25]

I have 33s and I put in a 3.9 gears. And I did notice a big diffence jumping from 3.55 to 3.9. So If you want econmy stick with the 3.9. If you dont mind a little less gas milage go with the 4.11s. the 4.11s will give you more power. Check out http://www.4lo.com/calc/geartable.htm They have a chart for best power and best economy. And they also have a tire change calculator. Check out www.ringpinion.com for good deals on ring and pinion sets. They have good quality stuff.