FREE 1 to 3-Day Delivery on Orders $149+ Details

Throtl Throwdown - May 2, 2026 Get Tickets! >

Find Gear Accessories for your Mustang

Richmond Rear Differential Mini Spool; 31-Spline (86-06 Mustang, Excluding V6)Find parts that fit my vehicle

Item 437491
Product Image
1 Reviews
Our Price

$147.82 each

Military, Medical & First Responders $7.39 Available in AM Cash Rewards.
Confirm Eligibility

CONFIRM THIS FITS YOUR VEHICLE!

Select a different vehicle Help?
Update or Change Vehicle
Add to Cart
Save for later
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    or use

    Shop Owners Save More! Sign up for our dealer program
    Join For FREE
    Loading Indicator

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation

      Features

      • Richmond Rear Differential Mini Spool
      • With 31-Spline Design for Strength and Durability
      • Provides Full Locking Action for Maximum Traction
      • Ideal for Drag Racing and Off-Road Applications
      • Constructed from High-Strength Steel
      • Eliminates the Need for Costly Limited-Slip Differentials
      • Direct Fit for Factory or Aftermarket 31-Spline Axles
      • Fits 1986-2006 Mustang, Excluding V6 Models

      Description

      Maximize Traction with a High-Performance Mini Spool. The Richmond Rear Differential Mini Spool is the perfect solution for Mustang owners looking for enhanced traction in high-performance applications. This component replaces the spider gears in the differential, ensuring full power is delivered to both rear wheels simultaneously, making it ideal for drag racing and off-road builds.

      Engineered for Strength and Reliability. Made from high-strength steel, this mini spool is designed to withstand high torque loads and aggressive driving conditions. By eliminating the need for a limited-slip differential, this cost-effective upgrade provides consistent traction without the added complexity of clutch-based or gear-driven limited-slip units.

      Installation. This product requires professional installation and proper setup within the rear differential.

      Application. This Richmond Rear Differential Mini Spool fits 1986-2006 Mustang, Excluding V6 Models.

      Richmond 78-8831-1

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      Installation & What's in the Box

      Installation Info

      Installation Time

      (approx) 2 Hours

      Difficulty Level:

      Light to Moderate mechanical skill required.

      Installation Guides

        No guide available for this part yet.

      What's in the Box

      • (1) Mini Spool
      5.0

      Customer Reviews (1)

      Questions & Answers

      No questions about this product yet. Ask the First Question

      Will It Fit My Mustang

      • Bullitt - 01
      • Cobra - 93, 94, 95, 96, 97, 98, 99, 01, 03, 04
      • Cobra R - 93, 95, 00
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Mach 1 - 03, 04
      • Other - 86
      • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06