Try the link below for info on the reconfigured day cab program from Freightliner. You can order your reconditioned truck by checking off options just like a new truck. Freightliner then custom builds this used truck to your specs and includes a warranty. These trucks were long haul big sleeper models so you know the miles were mostly in the upper 2 gears. Autoshift trans is available.
And yes, you do want the heavy front axle.
http://www.selectrucks.com/used-truc...d-day-cabs.asp
Bob