Bedlam wrote:
The 10.5 Sterling rear axle rated at 9750 lbs is used on the F250, SRW F350 and DRW F350. The Dana 80 is used on the F450 and F550 cab chassis models. The use limits vary on the Sterling due to the suspension pack and wheel choice for each particular model even though it is the same axle.
Not according to Ford at least in 2013. If you go to page 83 of their specifications found here:
2013 Ford Superduty SpecsYou see the 2013 F350 DRW uses the Dana 80 as well. Maybe they used the Sterling in previous years and changed it when they went to the 14,000 GVWR.