The 4.10 will get you more jump off the line and more tow capacity
with lower fuel mileage. 3.73 will have slightly less jump off the
line and lower tow capacity but will have better economy. Sometimes
the differences are negligable.
If you want to put on some larger tires error on the 4.10 side it will help
you a little more to make up for what the larger tires did for you. Guys
that tow, or live where there are lots of hills and mountains may like the
4.10's more (at the expense of miliage). If you are going to drive it on
the highway, not tow often, the 3.73's will give you more economy.
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