Had to make a run to town today. After driving it to town and back, I am feeling that something has got to give. 4.56 gears and non overdrive is not ideal for my usage. I was in high gear well under 30 miles per hour. I have an extra, very nice, complete 14 bolt cab and chassis 4.10 rearend under my workbench. I could put into it, but I might even be feeling 3.73s more than that. I hate to go to too much trouble and expense to swap from 4.56 to 4.10 and it still not be enough change. I need to do the math I guess to figure out my revs.