Eaton Detroit Locker Differential 31 Spline 1.32" Shaft Dia | Fits Ford 8.8" Axle | 4.56/4.88/5.13 Gear Ratios | Front/Reverse Rear
Eaton Detroit Locker Differential 31 Spline 1.32" Shaft Dia | Fits Ford 8.8" Axle | 4.56/4.88/5.13 Gear Ratios | Front/Reverse Rear
Eaton Detroit Locker Differential 31 Spline 1.32" Shaft Dia | Fits Ford 8.8" Axle | 4.56/4.88/5.13 Gear Ratios | Front/Reverse Rear
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Eaton Detroit Locker Differential 31 Spline 1.32" Shaft Dia

Eaton
eat187C145A
In stock
$1,045.99
The Eaton Detroit Locker Differential (Part #EAT187C145A) is the ultimate choice for off-road, towing, and high-performance...
$1,045.99

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Eaton Detroit Locker Differential 31 Spline 1.32" Shaft Dia

The Eaton Detroit Locker Differential (Part #EAT187C145A) is the ultimate choice for off-road, towing, and high-performance applications requiring maximum traction. Built for the Ford 8.8" axle with 31-spline and 1.32" shaft diameter, this locker is compatible with 4.56, 4.88, and 5.13 gear ratios. Its bullet-proof, clutchless design ensures both wheels remain engaged under all conditions – even if one wheel lifts off the ground. Maintenance-free and 100% automatic, the Detroit Locker provides reliable strength and performance whether driving forward or in reverse.

Unstoppable traction starts here — the Eaton Detroit Locker keeps your wheels locked, your power planted, and your vehicle moving, no matter the terrain.

Features and Benefits

  • 100% Automatic Locking – Engages both wheels without driver input

  • Maximum Traction – Keeps both wheel ends powered, even in extreme conditions

  • Clutchless, Maintenance-Free – Engineered for durability with no service required

  • Forward and Reverse Operation – Reliable performance in both directions

  • Heavy-Duty Design – Built to handle off-road abuse and high torque loads

Technical Specifications

Specification Details
Part Number EAT187C145A
Brand Eaton Detroit Locker®
Axle Type Ford 8.8"
Spline Count 31
Shaft Diameter 1.32 in
Gear Ratio Compatibility 4.56 / 4.88 / 5.13
Application Position Front / Reverse Rear
Design 100% Automatic Locking Differential
Maintenance Clutchless, Maintenance-Free


Vehicle Compatibility

Year Range Make Model Trim Engine Category
1986–1987 Ford Aerostar Base L4 -cc Drivetrain::Differentials
1986 Ford Aerostar Base V6 -cc Drivetrain::Differentials
1990–1997 Ford Aerostar Base V6 -cc Drivetrain::Differentials
1986–1997 Ford Aerostar Base V6 2986cc Drivetrain::Differentials
1990–1994 Ford Aerostar Eddie Bauer V6 -cc Drivetrain::Differentials
1988–1991 Ford Aerostar Eddie Bauer V6 2986cc Drivetrain::Differentials
1986–1987 Ford Aerostar XL L4 -cc Drivetrain::Differentials
1986 Ford Aerostar XL V6 -cc Drivetrain::Differentials
1990–1994 Ford Aerostar XL V6 -cc Drivetrain::Differentials
1986–1994 Ford Aerostar XL V6 2986cc Drivetrain::Differentials
1990–1994 Ford Aerostar XL Plus V6 -cc Drivetrain::Differentials
1989–1994 Ford Aerostar XL Plus V6 2986cc Drivetrain::Differentials
1991–1994 Ford Aerostar XL Sport V6 -cc Drivetrain::Differentials
1991–1994 Ford Aerostar XL Sport V6 2986cc Drivetrain::Differentials
2007–2011 Ford Focus SES L4 1999cc Drivetrain::Differentials
2013–2015 Ford Focus ST L4 1999cc Drivetrain::Differentials
2005 Mercury Grand Marquis Limited Edition V8 -cc Drivetrain::Differentials

(Always confirm axle type, spline count, and gear ratio before ordering.)

Note: If you are not sure about compatibility, please contact us with your vehicle details (such as VIN) so we can verify fitment for you.

What's Included

  • Eaton Detroit Locker Differential (31 Spline, 8.8")

  • Manufacturer installation instructions

  • Limited warranty documentation

REVIEWS

JD

This locker is a beast! Installed it in my F-150 and the traction difference is night and day. Works exactly as described with no driver input needed.

John D.

Denver, CO

★★★★★
MS

Perfect upgrade for my Jeep. It bites hard off-road and has held up to everything I’ve thrown at it so far. Definitely worth the investment.

Mark S.

Austin, TX

★★★★★
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Effective Date: October 2024
We offer a 30-day return policy, allowing you to request a return within 30 days of receiving your item. To qualify for a return, the item must be in its original condition—unused, with tags, and in its original packaging. A receipt or proof of purchase is also required.

To initiate a return, please contact us at info@riotparts.com. Returns must be shipped to the address provided upon request. If your return is approved, we will issue a return shipping label along with detailed instructions.

Important
Returns sent without prior authorization will not be accepted.

For any return-related inquiries, please reach out to us at info@riotparts.com.

Return Shipping Address
The return shipping address will be determined based on the requestor’s location to ensure the nearest return facility is used.

Possible return locations include:
10880 Lear Blvd.
Reno, NV 89506, United States
931 W. Bardin Rd., Suite 150–200
Arlington, TX 76017, United States
3035 Campus Dr.
Hatfield, PA 19440, United States
5789 N. Graham Road, Ste 200
Whiteland, IN 46184, United States
2020 NE Aloclek Dr 4711 N Lamon Ave
#118 STE 12, Hillsboro, OR 97124, United States

Damages and Issues
We recommend inspecting your order upon receipt. If you find that an item is defective, damaged, or if you received the wrong item, please contact us immediately so we can address the issue.

Exceptions / Non-Returnable Items
Certain items cannot be returned, including:
• Electrical parts that have been installed or used
• Special order parts that were custom ordered for you
• Items that have been damaged due to improper installation or use

If you have questions or concerns about a specific item, please contact us for assistance.

Exchanges
For exchanges, the quickest option is to return the item you have. Once the return is accepted, you can make a separate purchase for the new item.

Refunds
We will notify you once we receive and inspect your return to inform you whether your refund is approved. If approved, you will be automatically refunded using your original payment method within 10 business days. Please be aware that it may take additional time for your bank or credit card company to process and post the refund.

If more than 15 business days have passed since your return was approved and you haven’t received your refund, please contact us at info@riotparts.com.

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