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Ford Performance IRS Knuckle and Hub Kit (15-19 All)

Market Price $542.39 You Save 15% ($82.40)
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$479.99 (kit)

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  • Item 389952

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    Features & Details

    • Rear IRS Knuckle and Hub Kit
    • Direct Fit Replacement
    • Original Factory Equipment - OE Fit and Finish
    • Genuine Ford Part# M-5970-M
    • Cast Aluminum Knuckles
    • 5 X 4.5" - Five Lug Hub Design
    • Pre-Installed Wheel Studs, Bushings and Steel Roller Bearings
    • Driver and Passenger Side Included
    • Fits All 2015-2019 Mustangs
    Stay Safe. Have you been in an accident or experiencing excessive wiggle or play in your rear wheels? Then you may need to replace those worn out Rear IRS Knuckles and Wheel Hub Assemblies with a brand new set from Ford Racing. Bad knuckles and bearings are not something to be ignored, they should be replaced ASAP  to avoid a possible accident.

    IRS Knuckles. The included Ford Racing IRS Knuckles are manufactured to the original factory specifications from cast aluminum for superior strength and light weight. The Knuckles come with the bushings and steel roller bearings pre-installed for ease of installation.

    Genuine Ford Part. These genuine Ford Wheel Hub Assemblies are manufactured to the original factory specifications from OEM quality materials. The assemblies come complete with the bearings and studs already pressed into the hub for easier installation.

    Application. This Ford Racing IRS Knuckle and Hub Kit is designed to be a direct fit replacement for all 2015 to 2019 S550 Mustangs, including the V6, EcoBoost, GT and Shelby GT350 models.

    Fitment: 2015 2016 2017 2018 2019 Details

    MPN# M-5970-M

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Driver Side IRS Knuckle
    • (1) Passenger Side IRS Knuckle
    • (2) Rear Wheel Hub Assemblies
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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    Questions & Answers (1)

    1 Top Rated Question

    will this knuckle kit work with the GT350 rear brake system. I have a GT but getting ready to install a gt350 rear brake set up. According to the fords parts numbers (OEM) the knuckles for the GT and GT350 are different part numbers. Thanks

    • The Ford Performance IRS Knuckle and Hub Kit is compatible with GT350 rear brakes. This kit is designed to work with all models, including GT and GT350.

    Helpful (0)
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    Customer Reviews (2) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Afternoon

    • Handling Improvement 5 5
    • Fit 5 5
    • Bang For Your Buck 4.5 4.5

    • 5/5

      Installation Time: Afternoon

      May 08, 2018

      Great kit for the right buyer

      After having the unfortunately typical problem of an axle nut backing off and subsequently ruining a rear wheel bearing, I for sure needed new wheel bearings. I also wanted the toe link bearings, but heard a few horror stories about getting them installed (some seem to go easy, others need a 20 ton shop press). This kit gave me new rear wheel bearings and knuckles with the toe link bearings already installed. Includes the new hardware to install the wheel bearings to the knuckles. Bolted those together, then removed old knuckle/bearing assemblies and installed these. Went in easily, tweaked the alignment, and they work great! Toe link bearing does more than I expected; nice improvement during hard cornering. And of course my wheel bearings are quiet again. Took a few hours to install from start to finish, but once done with one side and you figure out what all to do the other side is about 30 minutes.


      Year: 2015 Submodel: GT

      Helpful (13)

    • 5/5

      Installation Time: Afternoon

      October 21, 2017

      OEM fitment, upgraded performance

      OEM fitment, with the added bonus of spherical toe bearings installed and a spare set of hubs. If you don't have a press for the sphericals, want to save yourself the hassle, or need to save your stock knuckles as-is, this is the droid you are looking for!


      Year: 2015 Submodel: GT

      Helpful (13)

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