I'm fairly new to 4x4's. I have a '78 blazer, 350, th350/np203, 4" lift, 33" M/T tires. I have a 12b rear and a 10b front with I'm guessing 3.08 ratio. It's a daily driver but my daily may only include 6 miles a day 4 days a week and on occasion I'll make a 20 mile trip to the "open til 9pm parts store". I want good pulling and towing ability and will probably go to 35's when I get new tires. I'm building it for off road ability and to heck with gas mileage. It's a ways down on the list. What gear ratio would I need. I'm thinking 4.56, but I don't really know squat about it.