Would appreciate some info on the rear axle of the high GVW F-150 rear axle. I have a lot of info on Visteon axles but very little on the 10.25, semi-float used in the HD '150s.

Here's what I know:

Ring Gear Dia: 10.38"
Hypoid Offset: 1.50-in.
GAW: 5,300#
Nominal GCVWR: 17,000#
Maximum Output Torque: 8,300 lbs-ft (short term)
Continuous Output Torque: 2,000 lbs-ft

What I want to confirm:

Axle shaft: Spline count, spline diameter, minor spline diameter (or shaft minimum diameter) (Note I believe it to have 35 splines like the previous 10.25 semi-float)

Axle Tubes: Outside diameter and wall thickness (no idea on this)

Many thanks!

 

I'll get back to you on the OD of the axle tubes but can't help you with the rest. Mine is not been apart....hopefully will never have to be.

 

This is directly from the 2008 Ford body builders information..

10.25" Rear axle has...

1.29" Diameter (minimum) axle

1.32" Diameter at splines

31 Splines

Holds 7.5-8.0 Quarts of fluid

no luck on tube diameters...

 

BandBFord: Thanks for looking, but I'm sure that is incorrect. I have several recent Ford Data books that list the same thing and also for the 9.75-inch... yet I have pulled 9.75s apart and they have 34 spline, 1.37-inch shafts. Also, if you look up various locker and limited slips for the 9.75, they list the same. Nobody lists a unit for the 10.25 semi-float in the '04 up F150 HDs specifically but I doubt the bigger, higher GAW/GCVWR rated 10.25 ring gear axle for the HD is going to have smaller axle shafts than the smaller, lighter-rated 9.75 axle. What I am trying to figure out is if I can swap the Truetrac from my '86 10.25 full-float Sterling over to this newer semi-float. The carriers in the 10.25 full float and the old '85-93 semi-floats interchange (both had 35 spline shafts) and I expect they do as well for the F-150. I just like to have things figgered out before I open the toolbox (as much as possible anyway) to minimize downtime.