If you crawl, wheel torque at low speeds will be increased due to the fact that you will be operating your vehicle within the engine's powerband (higher rpm) at the same low wheel speeds. You won't be lugging the engine as much.
Most importantly for crawling, lower gearing will also help out when your current gears don't allow you to go slow enough without clutching. With a good crawl ratio and bottom end torque at the wheels, you can lug over obstacles with much more control than with higher gearing.
Low gearing is very important on technical stuff. I run 4.88's with my 35's, and run about 50 rpm/mph ([email protected]
). If you dont do much technical driving, or play in the mud a lot, the extra wheelspeed of 4.10's is an advantage. (4.88 is about 20% lower than 4.10)
I don't take interstates, and drive mosly at about 55 mph in it. It's not too bad on the highway, and makes a good amount of difference on the trail. I went from 4.10's to 4.27's, and now the the 4.88's. My crawl ratio is about 85:1, and I'd eventually like to get 3.15 xfer gears to get down to 100:1.
On the surface roads in town, 4.88 is no less convenient than any other gearing. You just shift a little sooner and spend time in 4th gear when someone else would be in 3rd. I only notice a different when approaching highway speeds.