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Bad idea? Would it kill the mpg and make driving it a drag? Found a deal on axles and I have newish 30" BFG AT that I love. I often drive my rig with a lot of weight.
Its not as bad as you might think. I run that on the highway each day on my way to work. Average between 17-19 mpg. It does feel a bit gear bound though. Aftermarket air cleaner would probably help the engine rev a bit better. I run about 2500 @60-65. It never needs to downshift out of overdrive.
Hmmm, when not offroad I tend to either drive around town, where the mileage might actually improve, or trundle down the highway doing 60 with rooftent and and all my camping gear, so maybe it would work.
I run 4.56 with worn 31's that are worn much closer to 29.5" right now. 70MPH is right around 2800 RPM. A little high for my taste, but the mileage is still reasonable - about 18 MPH on the freeway, 14 street. The torque is sweet.
damn with stock tires and 3.55 stock gears, I was running 70mph at about 2600 to 3k depending on the road (with a 3in lift) I run it about 2200-2500 at 60 with 31s.
The very low ratio of the stock XJ may have as much to do with making good smog numbers. As good MPG. As well as less noise, engine wear. Also most engines made in the US of A are balanced anywhere from 800 to 1500 RPM so vibes can come into play as well. The factory boys have a lot more to think about when picking a final drive then just torque and MPG.