The rear axle nut size for the 2017 Ford F-550 is not universal; it varies depending on the axle type, wheel configuration, and hub design on your specific truck. Check the exact specification for your build to be sure.
Why the size varies
Several factors determine the exact nut size for a 2017 F-550’s rear hub. Different axle configurations (such as dual rear wheels versus a single rear wheel), hub assemblies, ABS integration, and whether the truck uses OEM or aftermarket components all influence the size. Because Ford used multiple axle suppliers and options across model years and trim levels, there isn’t a one-size-fits-all answer for all 2017 F-550s.
Factors that commonly affect the rear axle nut size include the following:
- Wheel configuration: dual rear wheels (DRW) versus single rear wheels (SRW) can change the hub and nut design.
- Axle manufacturer and model: different axles (Ford/Sterling or Dana Spicer variants) may use different nut diameters.
- Hub design and ABS integration: sensors and modules can influence the nut type and size.
- Drivetrain options and year-specific production changes: options like 4x4 versus 2WD can correlate with different hub assemblies.
Understanding these factors helps explain why a single, exact measurement isn’t published as a universal spec for all 2017 F-550 trucks.
How to determine the exact size for your truck
Before attempting to identify or replace the rear axle nut, use the following steps to verify the correct size for your specific 2017 F-550 configuration.
- Identify your exact axle and wheel setup by checking the vehicle’s VIN and build sheet or the Master Parts Catalog for your truck’s exact configuration.
- Consult the official Ford Workshop Manual or a dealer Parts Diagram for your VIN to locate the correct rear hub nut size and torque specification.
- Physically measure the nut or the corresponding socket size on the existing hub nut if you have access to the vehicle, ensuring you use proper safety procedures for jacking and supporting the vehicle.
- If in doubt, contact a Ford dealership or a qualified heavy-duty mechanic with your VIN and axle code to confirm the exact size and torque requirements.
Accurate identification is important because using the wrong nut size or torque can damage the hub, axle, or brake components and may compromise safety during operation.
Summary
There isn’t a single rear axle nut size that applies to all 2017 Ford F-550 trucks. The correct size depends on your specific axle, hub design, and wheel configuration. To ensure you use the right nut, verify the specification against your VIN-derived build data, consult the official service or parts manuals, or check with a Ford dealer or qualified technician. Always follow OEM torque specs and use the proper tools when servicing rear hub nuts.