I did some research and it seems the Super 60 axle is meant for the f550 trucks, which is way more than enough for your truck. Not to mention it's a 10 lugger.
http://www.fourwheeler.com/how-to/transmission-drivetrain/131-0906-dana-super-60-front-axle/Another option is the Dana 70 front axle. It was used in Kodiak trucks. http://en.wikipedia.org/wiki/File:DANA70HDKodiaks.jpg
On the other hand, the rear hubs from a Dana 60 or Dana 70 will fit the 14 bolt with the appropriate bearings. So it may be possible to use a 10 lug hub from a F-series. I'm not for sure about the hubs on the Sterlings axles, I would assume they're the same.
There's always this option too. http://www.boyceequipment.com/#!rockwell-25-ton-axles/c1so0
Chris
