I am looking to purchase a new truck, probably later this year. In the Ford brochure under the heading of “Mechanical” it lists “Rear Suspension” and shows “Axle rating, 6,200 LBS (F-250); 7,280 LBS (...
I looked up the part numbers and they are the same axle and brakes on the SRW's. The ratings are based on the suspension and wheel package that come with that configured model. To see the rear axle specification look up the Sterling 10.5" (the front is a Dana 60).