4.10 gears really BLOW

[72gord]

I believe tire size and engine really factor into gear selection to a large degree. A big block with a lot of torque will handle a higher gear easier than that 283 or 307. Also the taller tires on some 4x4's need deeper gears to keep the engine in its peak power rpm. Your location and use of the vehicle also factor in...I live in hiily country and often pull a trailer, my 2001HD has 4.10's and an 8.1, the over drive helps when I get out on the interstate. My 72 that is currently being redone has 4.56 gears, used to pull a trailer with it and loved the power it had even with a stock 350, gas mileage was another story, but it is tough to get power and mileage with out going to a turbo diesel. I get around 10 mpg with the 8.1 pulling an 18 foot trailer with a truck on it. the 72 would get about 8 mpg doing the same, difference being I can run 70 mph+ with the 2001 and could only go about 60-65 with the 72. JMO Thanks, Gord