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    Eaton Detroit Truetrac Helical Limited-Slip Differential | Ford 8.8in IFS Front 31-Spline | 917A738

    Vendor: Eaton
    Part Number: 917A738
    Regular Price $803.99

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    The Eaton Detroit Truetrac is a helical gear-driven limited-slip differential that maximizes available traction while sharpening handling and drivability. It works smoothly and automatically, needs no maintenance, and avoids the on/off behavior of a locker, which makes it a strong choice for street, tow, and trail use.

    • Type: Helical gear limited-slip differential
    • Axle: Ford 8.8in IFS snap-ring (front)
    • Ring gear: 8.8in
    • Axle shaft diameter: 1.32in
    • Spline count: 31
    • Gear ratio: fits all ratios
    • Part number: 917A738

    Vehicle Applications

    • 2009-2025 Ford F-150 (4x4 front axle)

    FAQ

    What vehicle is the Truetrac 917A738 for?

    It fits the Ford 8.8in IFS front axle used in the 2009-2025 Ford F-150 4x4, with a 31-spline count.

    Does it work with any gear ratio?

    Yes. This Truetrac fits all ring-and-pinion ratios for the 8.8in front axle.

    Does the Truetrac need maintenance or a switch?

    No. It is fully automatic, needs no maintenance, and has no switch or on/off behavior like a locker.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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