{"product_id":"ford-raptor-2021-2024-ultra-flex-joint-rear-upper-suspension-arms","title":"2021-2026 Ford F-150 Raptor Billet Rear Upper Trailing Arms - Ultra-Flex Joints","description":"\u003cdiv class=\"fmi-collection\"\u003e\n\u003cdiv class=\"fmi-intro\"\u003e\n\u003cp\u003e\u003cstrong\u003eBillet aluminum rear upper trailing arms for the 2021–2026 Ford F-150 Raptor and Raptor R, on our patent-pending Ultra-Flex joints.\u003c\/strong\u003e Sold as a pair with spacers and installation hardware, CNC machined in-house in Mesa, Arizona.\u003c\/p\u003e\n\u003cp\u003eThe upper links control axle wrap and pinion angle. From the factory they do it through rubber bushings that bind as the axle cycles and go soft with age. These bolt into the stock mount locations with no cutting, no welding and no new shocks — stock-length geometry, \u003cstrong\u003e15 inches of rear wheel travel\u003c\/strong\u003e on the factory rear shock.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fmi-accordion\"\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eWhat Is In The Kit\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cul\u003e\n\u003cli\u003e2 FMI billet aluminum rear \u003cstrong\u003eupper\u003c\/strong\u003e trailing arms\u003c\/li\u003e\n\u003cli\u003eUltra-Flex joints — 17-4 stainless steel center ball in a serviceable urethane body\u003c\/li\u003e\n\u003cli\u003eExternal grease zerk at each joint, low profile so it stays accessible with the arm on the truck\u003c\/li\u003e\n\u003cli\u003eAluminum ball post for the factory wheel position sensor, so the truck still reads ride height correctly\u003c\/li\u003e\n\u003cli\u003eSpacers and installation hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Ultra-Flex center ball is machined to the application, so no additional spacers are needed beyond what ships in the box. The ball post is aluminum on our billet links — our fabricated rear upper links use a steel ball post welded in instead — and it is only ever fitted to an \u003cem\u003eupper\u003c\/em\u003e link, never a lower.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\" open=\"\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eWhat The Upper Links Actually Do\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cp\u003eThe Gen 3 Raptor runs a five-link rear axle. The lower links take acceleration and braking load; the uppers control axle wrap and hold pinion angle where it belongs. The panhard bar handles side-to-side.\u003c\/p\u003e\n\u003cp\u003eEvery one of those connections is a rubber bushing from the factory. Rubber is chosen for isolation, not for location — it is soft on purpose. Under real load it compresses, the axle rotates and moves relative to where the chassis thinks it is, and you feel it as a rear end that will not settle.\u003c\/p\u003e\n\u003cp\u003eBillet arms on spherical joints replace that compliance with a defined pivot. Completing the set — panhard bar, lowers, then uppers — takes the last of the factory rubber out of the rear suspension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eThe Ultra-Flex Joint\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cp\u003eOur patent-pending joint, and the reason to choose this version over the uniball arms.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eHow it is built\u003c\/h3\u003e\n\u003cp\u003eA 17-4 stainless steel center ball pressed into a urethane body, which is pressed into a laser-cut stainless steel outer sleeve closed by two stainless side caps. The cartridge presses into the arm and is retained with a circlip. The grease zerk threads into a slotted hole in the sleeve, so the sleeve cannot rotate in the arm.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eWhy it matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreaseable on the truck\u003c\/strong\u003e through the external zerk — no removing the arm to service the joint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuiet.\u003c\/strong\u003e The urethane damps impact and isolates road noise instead of squeaking and clunking the way a worn uniball does.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion resistant.\u003c\/strong\u003e Stainless internals that stay constantly lubricated — what you want in wet, humid or salted conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRebuildable for the cost of a urethane body\u003c\/strong\u003e, not a complete joint assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects the arm.\u003c\/strong\u003e The stainless sleeve means urethane never works directly against your billet aluminum, so the bore stays true.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/news\/ultra-flex-joint-best-joint-billet-rear-links-panhard-bars\"\u003eRead the full Ultra-Flex joint breakdown →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eUltra-Flex Or Uniball?\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cp\u003eWe build the Gen 3 billet rear arms two ways. Both are billet aluminum, both bolt into the factory mounts, both give the same 15 inches of rear wheel travel. The joint is the only difference.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUltra-Flex\u003c\/strong\u003e — this kit. Greaseable in place, quieter as it wears, rebuildable with a urethane body, better in wet or salted conditions. The choice for a truck that still gets daily driven.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUniball\u003c\/strong\u003e — 1\" FK uniballs, tighter and more direct, and the uniball is a replaceable wear item. The choice if you specifically want a uniball and are comfortable pressing a bearing when it wears. See the \u003ca href=\"\/products\/gen-3-raptor-billet-aluminum-rear-suspension-upper-arms\"\u003euniball rear upper arms\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eFitment\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cp\u003eFits the Gen 3 and Gen 3.5 Ford F-150 Raptor, model years \u003cstrong\u003e2021, 2022, 2023, 2024, 2025 and 2026\u003c\/strong\u003e, including the \u003cstrong\u003eRaptor R\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe Raptor R uses the same rear suspension architecture as the V6 truck, so these fit it unchanged. Stock-length only — this is not a long travel kit and it does not change rear geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eInstallation\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cp\u003eBolt-on. The arms use the factory mount locations and the spacers are machined to suit, so there is no cutting, no welding, no fabrication and no alignment required afterwards.\u003c\/p\u003e\n\u003cp\u003eSupport the truck safely and take the load off the rear axle before removing the factory arms. We recommend the work is done by an experienced individual or shop. Guides are at \u003ca href=\"\/pages\/install-instructions\"\u003eInstall Instructions\u003c\/a\u003e, and we do in-house installation in Mesa.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eFinishes\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cp\u003eFour options: \u003cstrong\u003eraw billet aluminum\u003c\/strong\u003e, \u003cstrong\u003eblack anodized\u003c\/strong\u003e, \u003cstrong\u003eFOX orange anodized\u003c\/strong\u003e and \u003cstrong\u003eblue anodized\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eRaw is a finish choice, not a lesser part — plenty of builds run raw billet deliberately for the machined-aluminum look. Anodized parts should be cared for as anodized aluminum; see the care notes before you take a pressure washer or a harsh wheel cleaner to them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\" open=\"\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eQuestions\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003ch3 class=\"fmi-q\"\u003eDo these fit a 2025 or 2026 Raptor?\u003c\/h3\u003e\n\u003cp\u003eYes. They fit 2021 through 2026 Gen 3 and Gen 3.5 trucks, Raptor R included.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eWill the factory wheel position sensor still work?\u003c\/h3\u003e\n\u003cp\u003eYes. The upper arms carry an aluminum ball post for the factory wheel position sensor, so the truck reads ride height the way Ford intended. A lower link never carries one — the sensor only ever mounts to an upper.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eDo the arms include spacers and hardware?\u003c\/h3\u003e\n\u003cp\u003eYes. The kit ships as two billet aluminum rear upper arms with the spacers and installation hardware needed to fit them.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eDo I need the lowers too?\u003c\/h3\u003e\n\u003cp\u003eNot to install these, but the set is what removes all the factory rubber. If you are buying in stages, the order we recommend is panhard bar first, then \u003ca href=\"\/products\/ford-raptor-2021-2024-flex-joint-rear-lower-suspension-arm\"\u003elower trailing arms\u003c\/a\u003e, then uppers.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eCan I grease the joint without pulling the arm off?\u003c\/h3\u003e\n\u003cp\u003eYes. The low-profile external grease zerk stays accessible with the arm installed on the truck.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eWill they make the ride harsh?\u003c\/h3\u003e\n\u003cp\u003eNo. The urethane body damps impact and isolates road noise rather than transmitting it into the chassis, so you get the precise axle location of a spherical joint without the harshness that usually comes with metal-on-metal.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eWhat happens when the joint wears?\u003c\/h3\u003e\n\u003cp\u003eYou replace the urethane body, not the arm and not a complete joint assembly. Service parts are under \u003ca href=\"\/collections\/serviceable-parts\"\u003eServiceable Parts\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eDo I need an alignment afterwards?\u003c\/h3\u003e\n\u003cp\u003eNo. Stock-length arms into factory mounts do not change ride height or rear geometry.\u003c\/p\u003e\n\u003ch3 class=\"fmi-q\"\u003eWhere are they made?\u003c\/h3\u003e\n\u003cp\u003eDesigned, machined and finished in-house at our facility in Mesa, Arizona, USA.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"fmi-disclosure\"\u003e\n\u003csummary class=\"fmi-summary\"\u003e\u003ch2 class=\"fmi-summary-title\"\u003eFinish The Rear End\u003c\/h2\u003e\n\u003ci class=\"fmi-chevron\"\u003e\u003c\/i\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fmi-panel-body\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/gen-3-raptor-2021-2024-billet-panhard-bar-with-ultra-flex-joint\"\u003eBillet panhard bar with Ultra-Flex joint\u003c\/a\u003e — the one we would buy first\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ford-raptor-2021-2024-flex-joint-rear-lower-suspension-arm\"\u003eBillet rear lower trailing arms — Ultra-Flex\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/2021-ford-raptor-bump-stop-kit-by-foutz-motorsports-gen-3-raptor\"\u003eRear bump stop kit\u003c\/a\u003e and \u003ca href=\"\/products\/2021-2025-gen-3-raptor-rear-limit-strap-kit\"\u003erear limit strap kit\u003c\/a\u003e — the cheapest real gain on the truck\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/2021-2025-gen-3-raptor-5-link-gen-3-stock-rear-arm-frame-mount-gusset-kit\"\u003eRear link frame mount gusset kit\u003c\/a\u003e — the factory link mounts are the known crack point\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSide by side on \u003ca href=\"\/collections\/gen-3-raptor-rear-links-panhard-bar\"\u003eGen 3 Rear Links \u0026amp; Panhard Bar\u003c\/a\u003e, or the full catalog on \u003ca href=\"\/collections\/gen-3-raptor-rear-suspension\"\u003eGen 3 Raptor Rear Suspension\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Foutz Motorsports LLC","offers":[{"title":"Black Anodize","offer_id":44513868120276,"sku":"FMI050034120340191","price":1549.99,"currency_code":"USD","in_stock":true},{"title":"Blue Anodized","offer_id":44513868153044,"sku":"FMI050034120340193","price":1549.99,"currency_code":"USD","in_stock":true},{"title":"FOX Orange Anodized","offer_id":44513868185812,"sku":"FMI050034120340192","price":1549.99,"currency_code":"USD","in_stock":true},{"title":"Raw - Billet Aluminum","offer_id":44513868218580,"sku":"FMI050034120340100","price":1549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1054\/1650\/files\/2021-2024-ford-raptor-rear-upper-suspension-arm-flex-joint.png?v=1710376015","url":"https:\/\/www.foutzmotorsports.com\/products\/ford-raptor-2021-2024-ultra-flex-joint-rear-upper-suspension-arms","provider":"Foutz Motorsports","version":"1.0","type":"link"}