
Spyntec Hub Conversion Kit, Mile Marker hubs — 1999–2002 Ford F-250 / F-350 Super Duty, coarse threads — F9904C
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Suspension
Confirmed Compatibility
2005–2008 Ford F-250 and F-350 Super Duty. Supplied with Mile Marker hubs.
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Spyntec hub conversion kit with Mile Marker hubs for the 2005–2008 Ford F-250 / F-350 Super Duty.
A unit bearing is sealed, non-serviceable and turns whenever the wheel does. When it wears, the whole assembly is replaced. A free-spin conversion swaps that arrangement for fixed spindles with serviceable wheel bearings and manual locking hubs — bearings you can adjust and repack, and a front axle that stops turning when it is not needed.
Spyntec's case for it is straightforward: better fuel economy with the front axle disconnected, less wear on the front driveline, and the strength of a fixed spindle.
It also puts the choice of locking hub back in your hands — a mechanical hub you select rather than a sealed assembly you inherit.
This kit is the 2005–2008 version, supplied with Mile Marker hubs. Spyntec split this part three ways by year and thread, so confirm yours before ordering.
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