{"product_id":"rk08311-rock-krawler-rear-upper-arms-jeep-jl-jlu-2018","title":"Rock Krawler 2018+ Jeep Wrangler JL 2DR \/ JLU 4DR Pro Alum. Rear Upper Control Arms","description":"\u003ch4\u003eDial In Rear Pinion Angle Without the Extra Weight\u003c\/h4\u003e\n\u003cp\u003eCorrecting rear pinion angle after a lift is one of the most important steps for driveline longevity, and the RK08311 makes it simple. This upper control arm pair uses lightweight 7075 aluminum construction with a fully adjustable design so you can tune your Jeep Wrangler JL or JLU's rear geometry precisely, without the extra mass of a steel arm.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRK08311 X Factor PRO aluminum rear upper control arms made from 1.375 inch 7075 aluminum\u003c\/li\u003e\n\u003cli\u003eAdjustable Adventure Series joint at the frame end offers 35 degrees of misalignment\u003c\/li\u003e\n\u003cli\u003eKrawler series joint at the axle end adds additional misalignment capability for a combined 95 degrees\u003c\/li\u003e\n\u003cli\u003eFully adjustable in the vehicle for precise rear pinion angle tuning\u003c\/li\u003e\n\u003cli\u003eMachined wrench flats at the arm center simplify jam nut tightening\u003c\/li\u003e\n\u003cli\u003eLightweight aluminum construction reduces unsprung weight versus steel arms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2026\u003c\/td\u003e\n\u003ctd\u003eJeep\u003c\/td\u003e\n\u003ctd\u003eWrangler JL\/JLU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eRK08311\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocation\u003c\/td\u003e\n\u003ctd\u003eRear Upper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e1.375 inch 7075 aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjustability\u003c\/td\u003e\n\u003ctd\u003eFully adjustable, both ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e2 (pair)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eRock Krawler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Pair Rock Krawler RK08311 X Factor PRO aluminum rear upper control arms\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout Rock Krawler\u003c\/h4\u003e\n\u003cp\u003eRock Krawler Suspension has spent decades engineering long arm and mid arm suspension systems, control arms, and shocks purpose built for Jeep Wrangler and Gladiator platforms. Based in New York, the company is known among off road enthusiasts for service free joints, abuse proof warranties, and components tested on real trails before they reach the shelf.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rock-krawler-2018-jeep-wrangler-jl-2dr-jlu-4dr-front-upper-control-arms\"\u003eRock Krawler 2018+ JL\/JLU Front Upper Control Arms\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rock-krawler-2018-jeep-wrangler-jl-2dr-jlu-4dr-x-series-rear-lower-control-arms\"\u003eRock Krawler 2018+ JL\/JLU X Series Rear Lower Control Arms\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/rock-krawler-2018-jeep-wrangler-jl-2dr-jlu-4dr-front-upper-adventure-series-control-arms\"\u003eRock Krawler 2018+ JL\/JLU Front Upper Adventure Series Control Arms\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the RK08311?\u003c\/strong\u003e\u003cp\u003eThe RK08311 is a Rock Krawler X Factor PRO aluminum rear upper control arm pair for 2018 and newer Jeep Wrangler JL and JLU models, designed to let you adjust rear pinion angle after installing a lift.\u003c\/p\u003e\n\u003cstrong\u003eDoes it fit both the JL two door and JLU four door?\u003c\/strong\u003e\u003cp\u003eYes, this upper control arm fits both the two door JL and four door JLU since the rear suspension mounting points are shared.\u003c\/p\u003e\n\u003cstrong\u003eWhy do I need to adjust pinion angle after a lift?\u003c\/strong\u003e\u003cp\u003eLifting the suspension changes the angle between the driveshaft and pinion, and correcting it with an adjustable arm helps reduce vibration and extend U joint life.\u003c\/p\u003e\n\u003cstrong\u003eIs the RK08311 heavier than a steel control arm?\u003c\/strong\u003e\u003cp\u003eNo, the 7075 aluminum construction is lighter than comparable steel upper control arms while maintaining strength for off road use.\u003c\/p\u003e\n\u003cstrong\u003eCan I adjust this arm without removing it from the vehicle?\u003c\/strong\u003e\u003cp\u003eYes, the arm is designed to be fully adjustable in the vehicle so you can fine tune length without disassembly.\u003c\/p\u003e\n\u003cstrong\u003eWhat is the total misalignment capability of this arm?\u003c\/strong\u003e\u003cp\u003eThe combined Adventure Series and Krawler series joints provide up to 95 degrees of total misalignment capability.\u003c\/p\u003e\n\u003cstrong\u003eWhat warranty applies to the RK08311?\u003c\/strong\u003e\u003cp\u003eRock Krawler backs this control arm pair with a Lifetime Warranty against manufacturing defects.\u003c\/p\u003e\n\u003cstrong\u003eDoes installation require any special tools?\u003c\/strong\u003e\u003cp\u003eStandard hand tools and a torque wrench are sufficient, along with the machined wrench flats for tightening the jam nuts.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eRaise and safely support the rear of the Jeep on jack stands.\u003c\/li\u003e\n\u003cli\u003eSupport the rear axle with a floor jack to control droop during removal.\u003c\/li\u003e\n\u003cli\u003eRemove the factory rear upper control arm bolts at the frame and axle mounting points.\u003c\/li\u003e\n\u003cli\u003eRemove the factory arms and set them aside.\u003c\/li\u003e\n\u003cli\u003eThread the jam nuts onto the new arms and install them at the frame and axle brackets finger tight.\u003c\/li\u003e\n\u003cli\u003eAdjust arm length to achieve the correct rear pinion angle for your lift height.\u003c\/li\u003e\n\u003cli\u003eTorque all mounting hardware to the vehicle manufacturer's specifications.\u003c\/li\u003e\n\u003cli\u003eTighten the jam nuts against the adjuster sleeve using the machined wrench flats.\u003c\/li\u003e\n\u003cli\u003eCycle the suspension by hand to confirm clearance, then lower the Jeep and verify pinion angle.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Rock Krawler","offers":[{"title":"Default Title","offer_id":46246084083791,"sku":"RKRRK08311","price":392.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/rock-krawler-rk08311-rear-upper-control-arms-1_f95afc00-f329-4cb2-a62c-f74ac550af6f.webp?v=1785186174","url":"https:\/\/www.blackopsautoworks.com\/products\/rk08311-rock-krawler-rear-upper-arms-jeep-jl-jlu-2018","provider":"Black Ops Auto Works","version":"1.0","type":"link"}