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Message: [QUOTE="TyCorr, post: 186996, member: 1451"] A couple things I would consider A) are you going to stay with 37's? B)where do you do most of your driving C)How do you drive First off, are you definitely staying with 37+" tires? If you decide to run a wide 35 on a 12" wheel a year from now you'll hate 4.30 gears. With 37's and 4.30's you may be on par with what a stock truck has for gearing with stock tires but the trucks were over-geared to begin with. 3.73's and a 7.3 towing at 60mph and under is great. A 35 with 4.30's would be screaming if you drove 75 on an interstate. Something to think about. Secondly, if you drive on two lanes and in town mostly you'd want lower(numerically higher) gears to keep space between gears shorter. Kind of how a stock 5r wiiiiiinds-shifts-wiiiiiiind-shifts....nice tight shift interval. If you are running 4.10s you'd be more suited for a 55+ mph tow rig. I personally think 4.30's would be too much for a truck that might run across the country or state to state. You can always downshift but if you're in high gear and need more, SOL! This third point, How you drive?, kinda ties in with the one above. If you like to stab the pedal and get up to your intended speed in eight seconds and then cruise Id go with the lowest gear you can handle at cruising rpms. If you get your roll on at a gentlemans pace and take your time getting the rig up to speed choose the higher pinion set. Let er wind up to each shift. I personally would probably choose 4.10's but cant see doing all that bs just to gain .37/ratio. If your diffs are shot and need it anyway you can pick whatever you want. In closing, Id like to say that with 3.73's the pedal to the floor acceleration can be slightly cumbersome but when cruising at 70mph empty Im sippin fuel! If Im towing and wanna run 65, lock out the o/d and you're right where a stock truck would be runnin... [/QUOTE]