Yes, the truck's engine will turn the wheels with 4.88 gears.  The truck will be a little under powered, 5.29 gears would be a better, but the 4.88's are better than stock gears.

This calculator will give you an idea of the difference in performance
http://www.4crawler.com/4x4/4LoCalc.shtml?rp=3500&td=25.4&ar=4.56&tr=1&tc=1&mp=68.26195390436878
Your transmission gears are here
http://www.marlincrawler.com/tech/transmission/transmission-gear-ratio-chart