Yukon Gear 1541H Alloy Left Hand Rear Axle For 99-04 Ford 9.75in F150 and Expedition

Yukon Gear 1541H Alloy Left Hand Rear Axle for 1999 to 2004 Ford 9.75 Inch F-150 and Expedition

The YA F975006 is a high-quality 1541H microalloy steel left rear axle shaft designed for the Ford 9.75 inch rear differential used in 1999 through 2004 F-150 and Expedition models. The Ford 9.75 inch axle is a robust semi-float design, and when the factory shaft wears or breaks, the YA F975006 provides a direct OE-compatible replacement that exceeds the strength of standard 1040 alloy replacements. Built from 1541H microalloy steel with precision-machined splines and a correctly machined bearing journal, YA F975006 restores full towing and hauling capability to these popular light-duty trucks. The left-side shaft matches OE dimensions for a straight-forward installation without modifications.

Features and Benefits

• Left rear axle shaft for 1999-2004 Ford 9.75 inch F-150 and Expedition
• 1541H microalloy steel for improved strength and fatigue life over 1040 replacements
• Precision-machined splines for smooth differential side gear engagement
• Correct bearing journal diameter for OE bearing fit
• Direct drop-in replacement requiring no modifications
• Covers F-150 SuperCrew, SuperCab, Regular Cab, and Lincoln Navigator
• Pair with right-side shaft for a complete left-right replacement
• Backed by Yukon Gear manufacturer limited warranty

Vehicle Fitment

Specifications

What Is Included

• One 1541H alloy left rear axle shaft (YA F975006)

Frequently Asked Questions

Does installing YA F975006 affect my factory warranty?
The Magnuson-Moss Warranty Act prevents dealers from voiding your warranty simply because an aftermarket part was installed. The manufacturer must show the part directly caused the failure in question.

What is the difference between the Ford 9.75 inch and 8.8 inch axle in the F-150?
The 9.75 inch was a larger, heavier axle introduced in the late 1990s for higher tow-rated F-150 SuperCrew and towing-package trucks. It is identifiable by a larger ring gear diameter and a different differential cover shape. The 8.8 inch remains in lighter-duty applications.

Is YA F975006 the left or right shaft?
YA F975006 is the left (driver side) rear axle shaft. If you need the right side, a separate Yukon Gear part number applies.

What causes F-150 9.75 inch axle shafts to fail?
High-torque gas engines, aggressive trailer towing, off-road use, and lifting/wheel packages that increase stress on the axle are the most common causes of shaft fatigue. 1541H steel provides a significant improvement in torsional fatigue resistance over standard replacements.

Can I install YA F975006 without removing the differential?
The Ford 9.75 inch uses a C-clip axle shaft retention system. The differential cover must be removed to access and remove the C-clips before the shaft can be withdrawn. The procedure does not require removing the carrier or ring and pinion.

What gear oil does the Ford 9.75 inch axle require?
Ford recommends 75W-140 full synthetic gear oil with a limited-slip friction modifier if the axle is equipped with a limited-slip differential.

Does YA F975006 work with factory ABS?
The Ford 9.75 inch axle ABS sensors are mounted on the differential housing rather than on the axle shaft itself in most applications, so this shaft does not require an integrated reluctor ring.

What warranty covers YA F975006?
Yukon Gear provides a manufacturer limited warranty against defects in materials and workmanship from the date of purchase.

Installation Instructions

1. Raise and support the vehicle safely. Remove the wheel and tire on the driver side.
2. Remove the brake caliper, caliper bracket, and rotor on the driver side to allow access.
3. Remove the differential cover and drain the gear oil completely.
4. Remove the pinion shaft lock bolt and slide out the pinion shaft from the carrier.
5. Push the axle shaft inward toward the differential to expose the C-clip on the shaft end.
6. Remove the C-clip with needle-nose pliers. Slide the axle shaft out of the axle tube.
7. Inspect the axle bearing and seal while the housing is open. Replace if worn or leaking.
8. Apply a light coat of clean gear oil to the spline end of YA F975006.
9. Slide the new shaft into the axle tube and engage the splines with the differential side gear.
10. Install the C-clip into the shaft groove. Pull the shaft outward to seat the C-clip against the side gear bore.
11. Reinstall the pinion shaft and torque the lock bolt to Ford specification.
12. Clean the differential cover mating surface. Install cover with new RTV sealant and fill with correct gear oil.
13. Reinstall the rotor, caliper bracket, and caliper. Reinstall the wheel and tire and torque lug nuts to spec.
14. Road-test and inspect for leaks after 50 miles.

Proposition 65 Warning: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.