Sorry, another gearing thread. I have a '75 K5 350/th350/203 with one ton running gear, spool in the 14 bolt, and a Detroit waiting to go into the 60. I am running 35 inch Boggers, but will eventually be going to 38.5's. I currently have 4.10's. This only sees the road on the way to the trail, no highway running. I am trying to decide between 4.88's and 5.13's. I would really like to go with 5.13's if I can. Using this gear calculator http://www.grimmjeeper.com/gears.html I have ran both and found that I will be turning 3000 RPMs at 58 mph with 5.13's. I don't feel super comfortable doing anything over 55 anyways with this truck so no worry there. However, I am somewhat concerned about turning 3000 rpms for the run to the trail and home. If I go with 4.88's will I be sorry down the road when I go 38's? For the cost of the gears and time to install I only want too have to do this once. A trailer would be nice, but with the cost of trailers up here, that just is not in the cards. Sorry for the book, and I appreciate any help or recommendations you guys who have ran these gears can give me.