F-250/F-350?

Many thanks for that. Lots of useful info there.

And if I read it right on p85, the F350SRW has a bit heftier Sterling rear axle than the F250, in addition to the suspension diffferences.

This is a known mis print where the numbers are in the wrong columns. Ford uses the Sterling for the F250 and F350 SRW which has the 1.36/1.50/35 spline.

The F350 DRW uses the Dana 80 with the bigger 2 pinion 1.50/1.57/37 spline axle.

And so on down the column with the F450 using the 4 pinion S111 axle.
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This gets posted just about every time we have a F350 SRW vs the F250;

*F250 vs F350 SRW


The axles are identical as is every other part between the 250 and SRW 350. The 250 is de-rated from the factory as are it's axles. The two small differences generally sited between the two, the 4" vs. 2" block and overload spring, can actually be ordered on the 250. The 4" block comes with the FX4 and plow prep and the overload comes with the camper pkg. So, a 250 can be ordered with every part identical to the 350 SRW. Here are the part numbers for a 2012 F250 vs. F350. I chose 2012 but the results are the same if you search any year of the current generation from 11-15.

F250 Left Rear Axle BC3Z4234C
F250 Right Rear Axle BC3Z4234D

F350 Left Rear Axle BC3Z4234C
F350 Right Rear Axle BC3Z4234D

And here are the links to verify:

2012 F250 https://www.silverstatefordparts.com...R%20SUSPENSION


2012 F350 https://www.silverstatefordparts.com...R%20SUSPENSION


Here is a link to the question being asked directly to a Ford engineer when they were on the FTE forums answering questions about the 2015 motor update. They were only there to answer questions about 2015 so the MY is mentioned but is irrelevant as they are all the same. Meet the Team Behind the 2015 Ford F-Series Super Duty, May 1-May 16, 2014 - Page 9 - Ford Truck Enthusiasts Forums*