Quote:
Originally Posted by JRTJH
If you go to the Ford Build Sheet, you will see that for the 2013 F250/F350 the rear spring packs are "rated" 6100/6730. This might be done with "mirrors and silk scarves" (magic) but I think it's more than a spring spacer to increase the spring rating that much.
Also, the rear axles are different between the F250, F350SRW and F350DRW' Here are the differences per the charts on page 83 of the build sheet:
Axle Shaft — Spline Minor Dia. (in.) 1.36 1.50 1.35 —
Spline Major Dia. (in.) 1.50 1.57 1.42 —
No. of Splines (Hub End) 35 37 35
As you can see, the axle shaft the spline diameter and the number of splines is larger on the F350 SRW. With dual rear wheels, the axle shafts and spline measurements return to "near" the F250 measurements. I don't believe the same "rear axle assembly" can be installed in both vehicles with these differences in axle shaft machining. I did not check the 2012 or previous model years, so they may have the same axle assemblies, but the 2013 F250 and F350SRW do not have the same rear axle or spring packs.
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John the axle listing in the build sheet is a misprint that has been around for the past 3 years. If you go to the actual parts book and look up the numbers you will find that they are the same for both the 250 and the 350 SRW. Many of us on the Ford Truck forum have done so and even a Ford engineer answered the question with an affirmative. Brakes are the same, axle is the same, frame is the same, springs are the same.
The additional rear axle rating comes from the tires and wheels.. Mine are LT245/75R17E which have a load rating of 3195 so it'd be kind of difficult to get that 6730 from that...
The F350 has rear axle ratings from 6290 when equipped with the same tire I have. When equipped with 18"& 20" tires it jumps to 6730.
http://www.fordparts.com/Commerce/Ca...=Ford&mo=F-250 Super Duty#Search
5560
Rear Spring
Ford 250 Series Wide Frame (Pickup) With Single Rear Wheels Ford 350 Series ; 2WD, With Diesel Engines, Ford 350 Series, 158"/4013MM Wheelbase, 156"/3962MM Wheelbase, 172"/4369MM Wheelbase