You've asked that we talk about axle strength and selection in the 2015 F-150. Let's have your questions for our engineers.

 

Can we get any actual specs on the axles? Weight capacities? Torque maximums? Spline count, shaft diameter? Differences from previous model years?

What's different between the 9.75" and the HD axle used in the heavy payload package?

 

Thanks Tom, we'll see what our Engineers have to say.

 

Still hoping for an answer to at least if there is any difference in the axles......

 

Wow. The gears move slowly. I too would like to see an answer.

 

I too would like to see the answers to these questions. Thanks Tom for asking these questions.

 

Thanks for sticking with us everyone, our apologies for the delay but here's what our engineers has to say:

"Main differences between 3.73 Light Duty vs Heavy Duty Axle are:

Axle Tubes: Different length (shorter than LD)
Axle shafts: HD = 35T spline, LD = 34T spline
Axle Diff Assemblies: HD = 35 tooth e-locker, LD = 34 tooth e-locker"