Yukon Gear Steel Differential Spool for Ford 10.25/`10.5 w/ 35 Spline Axle

The Yukon Gear & Axle YP FSF10.25-35 Differential Spool is a full-spool assembly built for Ford 10.25″ / 10.5″ rear ends using 35-spline axles and 12-bolt housings. Designed for performance use, it ensures both sides receive equal torque all the time—ideal for aggressive off-road, high horsepower, or track builds. 

Key Features & Specs

• Application: Ford 10.25″ / 10.5″ rear differential, 35 spline, 12-bolt case 
• Spool Type: Full spool — connects both axle shafts rigidly for 100% torque to each side 
• Pressure Angle: 45° — optimized for aggressive ring & pinion engagement 
• Material & Build: Heavy-duty machining and design for durability under high load 
• Finish & Color: Black anodized or oxide coating for corrosion resistance 
• Pricing / Stock: $755.89, 56 units in stock 
• Shipping / Warranty: Ships same day; 1-year limited warranty (check terms) 

Why Choose This Spool?

• Eliminates Slip & Wheel Spin — Because both axles are locked together, you avoid loss of traction under load or in loose terrain.
• High Strength Under Load — Suitable for builds with heavy power, lifted rigs, and high-demand off-road use.
• Precision Engineered — Manufactured by Yukon, known for tight tolerances and quality differential components.
• Serviceable Upgrade Path — Works with existing housing and bolt pattern; internals may be replaceable without replacing the entire spool. 

Fitment Considerations & Notes

• Only compatible with Ford 10.25 / 10.5″ rearings that use 35-spline axle shafts and 12-bolt housings. 
• Using this spool means both wheels turn equally — there is no differentiation in cornering, which can increase tire wear and stress in tight turns.
• May require re-calibration of ABS, traction control, or speed sensors depending on your vehicle setup.
• Use proper break-in procedures for new spool to ensure longevity and proper seating of parts.

Questions? We’re Here to Help.

Have questions about differential or drivetrain upgrades for your truck? Our team at FASS Motorsports is here to assist:

• Phone: 636-429-7020
• Email: info@fassmotorsports.com