FDS 75 Rockwell steering axle September 02, 2021 05:33AM
Did the Rockwell FDS 75HDX come in different widths?
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Re: FDS 75 Rockwell steering axle September 02, 2021 05:57AM
Nope.
Not hard to change them.
Axle shafts and better joints available at different places.
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Re: FDS 75 Rockwell steering axle September 02, 2021 06:02AM
What is the Difference between the FDS 75 and the FDS90?
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Re: FDS 75 Rockwell steering axle September 02, 2021 08:36AM
Not familiar with FDS 90
I'm used to the FDS 75 and FDS 78
The 78 has larger axle shafts.
Now I gotta go research the 90.
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Re: FDS 75 Rockwell steering axle September 03, 2021 11:19PM
FDS90 was rated for 9,000 lbs I believe it was fine spline (34 spline)
FDS75 was rated for 7,500 lbs and was coarse spline (19 spline)

Probably the other main differences between the two lie in the brakes that they put on them. Kind of like 17-145 vs 19-145 vs 20-145. They had the same center section, just different brakes.

I built my front end with an F106 center and 2.5 ton Rockwell outers/knuckles/etc. The 2.5 ton stuff is significantly cheaper than the FDS stuff and more readily available.
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Re: FDS 75 Rockwell steering axle September 04, 2021 01:56PM
Is the fds90 still the 6 bolt lug pattern?
I have built some fronts the same way you did.
TRB makes nice axle/u-joint assemblies for the military 2 1/2 ton steering knuckles.
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Re: FDS 75 Rockwell steering axle September 07, 2021 11:39PM
Yes 6 lug
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Re: FDS 75 Rockwell steering axle November 14, 2021 08:36AM
My FDS 90 is 10 lug. 1989 GMC C7000 Marmon Herrington
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