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    Sale!New!

    QA1 Upper Adjustable Trailing Arms | 1979-2004 Ford Mustang & Mercury Capri | 5255

    Vendor: QA1
    Part Number: 5255
    Save $41.71
    $386.95 $428.66

    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 QA1 5255 upper adjustable trailing arms allow easy rear suspension adjustment for 1979-2004 Ford Mustang and 1979-1986 Mercury Capri. The pinion angle is set by loosening the jam nuts and turning the arm without removing it from the vehicle. They replace the soft OE differential bushings with polyurethane and use a spherical ball or rod end with UHMW polyethylene bushings on the chassis end to let the suspension move freely and eliminate bushing bind. The adjustable arms are zinc plated and anodized and are sold in pairs.

    Specifications:

    • Type: upper adjustable trailing arms, sold in pairs
    • Adjustment: pinion angle, set on the vehicle via jam nuts
    • Differential end: polyurethane bushings
    • Chassis end: spherical ball or rod end with UHMW polyethylene bushings
    • Finish: zinc plated and anodized
    • Made in the USA
    • Part number: 5255

    Vehicle Applications:

    • 1979 Ford Mustang
    • 1980 Ford Mustang
    • 1981 Ford Mustang
    • 1982 Ford Mustang
    • 1983 Ford Mustang
    • 1984 Ford Mustang
    • 1985 Ford Mustang
    • 1986 Ford Mustang
    • 1987 Ford Mustang
    • 1988 Ford Mustang
    • 1989 Ford Mustang
    • 1990 Ford Mustang
    • 1991 Ford Mustang
    • 1992 Ford Mustang
    • 1993 Ford Mustang
    • 1994 Ford Mustang
    • 1995 Ford Mustang
    • 1996 Ford Mustang
    • 1997 Ford Mustang
    • 1998 Ford Mustang
    • 1999 Ford Mustang
    • 2000 Ford Mustang
    • 2001 Ford Mustang
    • 2002 Ford Mustang
    • 2003 Ford Mustang
    • 2004 Ford Mustang
    • 1979 Mercury Capri
    • 1980 Mercury Capri
    • 1981 Mercury Capri
    • 1982 Mercury Capri
    • 1983 Mercury Capri
    • 1984 Mercury Capri
    • 1985 Mercury Capri
    • 1986 Mercury Capri

    Installation Instructions

    FAQ

    What does the QA1 5255 trailing arm kit include?

    The kit includes two upper adjustable trailing arms with jam nuts, sold as a pair.

    How are these trailing arms adjusted?

    The pinion angle is set by loosening the jam nuts and turning the arm, which can be done without removing the arm from the vehicle.

    What bushings do they use?

    They use polyurethane bushings on the differential end and a spherical ball or rod end with UHMW polyethylene bushings on the chassis end to eliminate bushing bind.

    What vehicles does the 5255 kit fit?

    They fit 1979-2004 Ford Mustang and 1979-1986 Mercury Capri.

    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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