DayCab Vs Sleeper

[Waterloo]

Personally, I would not have anything less than 3:55 gearing, 3:75 would be better, 3:90 would be the bomb if everything matches up. But, for fuel economy you have to keep your foot out of it. I ran that little 360hp Volvo, 9 speed, at 60-63 mph and she was consistently over 8 mpgs. Didn’t matter the conditions, she was consistent across the board.

Right now I’m running 3:34 gearing and it is terrible for what I do. 3:75 -3:90 would be ideal. I’m not racing up and down the road at 70+ mph. The gearing is to high for what I do, a lot of stop and go, lugs the hell out of the motor as the drop in rpms is so severe between shifts. I’m fast, but not that fast. I have wanted to swap out the boxes since I bought the truck, but other issues have prevented that.