Yukon YP MINSF8.8-31 Rear 31-Spline Mini Spool for 86-14 Ford 8.8" Axle

Regular price: $161.95
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Product Specification:

SKU:YUKYP MINSF8.8-31

MPN: YP MINSF8.8-31

UPC: 883584322269

Weight: 5.6 lb

Inventory: 6

Type: Differentials

Vehicle Fitment

1986-2014 Ford Mustang (5.0L / 4.6L / 3.7L; GT / LX / Cobra with 8.8" 31-spline rear axle)
1986-2001 Ford F-150 (4.2L V6 / 4.6L V8 / 5.4L V8; RWD & 4WD with 8.8" 31-spline rear)
1986-2010 Ford Ranger (4.0L V6; 8.8" 31-spline rear)
1991-2010 Ford Explorer (4.0L / 4.6L with 8.8" 31-spline rear axle)
1991-2010 Mercury Mountaineer (4.0L / 4.6L with 8.8" 31-spline rear axle)
1991-2010 Ford Bronco II / Explorer Sport Trac (8.8" 31-spline rear)
1991-2005 Ford Crown Victoria / Mercury Grand Marquis (Police & Performance models with 8.8" 31-spline)
1991-2014 Ford E-150 / E-250 (RWD with 8.8" 31-spline rear axle)

Fitment Notes

For vehicles equipped with a Ford 8.8" rear differential and 31-spline axles only.
Not compatible with 28-spline differentials or 9" rear axles.
For use in non-C-clip 8.8" carrier housings only (C-clip version requires different part).
Intended for racing and off-road applications -- not recommended for street use due to locked differential behavior.

Features

Eliminates spider gears for 100% lockup between both rear wheels
Provides maximum traction in drag racing and off-road environments
Manufactured from high-strength 8620 billet steel for superior durability
Direct fit into OEM carrier -- no machining required
Compact design fits inside standard open carrier case
Compatible with OEM ring & pinion and differential bearings
Heat-treated for strength and wear resistance under high-torque loads
Made in the USA and backed by Yukon's limited warranty

Specifications

Part Number: YP MINSF8.8-31
Type: Mini spool differential insert
Axle Size: Ford 8.8" rear axle
Spline Count: 31
Differential Type: Non-C-clip
Material: 8620 forged billet steel
Position: Rear
Use Case: Drag racing / off-road competition

Included Components

1x Mini spool assembly (YP MINSF8.8-31)
4x Steel cross pin gears
Installation instructions

Product Description

The Yukon YP MINSF8.8-31 mini spool is engineered for Ford 8.8" rear axles with 31-spline axles, delivering a fully locked differential for maximum traction in drag racing, off-road, or dedicated competition builds. By replacing the factory spider gears with a solid steel unit, this mini spool ensures both rear wheels rotate together for improved launch and traction performance.

Manufactured from premium 8620 billet steel and heat-treated for strength, the YP MINSF8.8-31 installs directly into a standard open carrier without modification. This part is intended for non-C-clip axles and is not recommended for daily street use due to its locked differential behavior. For racers and off-road enthusiasts seeking consistent traction and strength, it's a proven upgrade solution.