I have an '03 f150 with a 9.75" outback and a 8.8" upfront. I am starting to do more and more muddin with my truck. I want my axles to be able to take a beating. Would shaft replacements be a good upgrade?

Dont think there are any shaft options for a 9.75, might be able to go custom. SAS this bitch with a sterling out back and a 60 up front :grinpimp:

He already has a sterling in the rear :flipoff2:, you'll be busting the front way before the rear goes (33spl shafts in the rear if i remember right).

Get its big brother :grinpimp:

34 spline. You probably won't have enough power to break that sucker. Chances are a half-shaft will go down far before the 9.75.