It will be slow, but at least you'll keep your RPMs down on the highway and save gas. The only way you'll really know for sure is to try it and then upgrade to 4.10s if its real bad. This also puts extra stress on your tranny so be careful. I have 32's with 3.73's and thats managable but I wouldn't go any bigger.(mine are muds too though and are a little heavier)