{"product_id":"dorman-521-555-suspension-control-arm-and-ball-joint-assembly-rear-left-upper-rearward","title":"Dorman 521-555 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper Rearward","description":"\u003ch2\u003eOverview of Dorman Suspension Control Arm and Ball Joint Assembly\u003c\/h2\u003e\u003cp\u003eThe Dorman 521-555 suspension control arm and ball joint assembly is designed for precise fitment on select BMW models, including the 740i, 740iL, 750iL, and Z8. This assembly combines a durable steel control arm with a pre-installed ball joint to ensure reliable suspension performance and vehicle stability.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePre-greased ball joint for immediate use\u003c\/li\u003e\n\u003cli\u003eIncludes rubber bushings for vibration dampening\u003c\/li\u003e\n\u003cli\u003eSteel control arm with casting\/forged construction\u003c\/li\u003e\n\u003cli\u003eBolt-in ball joint with threaded stud (14 mm thread diameter)\u003c\/li\u003e\n\u003cli\u003eMounting hardware included for straightforward installation\u003c\/li\u003e\n\u003cli\u003eControl arm dimensions: maximum length 237 mm, maximum width 288.5 mm\u003c\/li\u003e\n\u003cli\u003eSingle mounting hole with 12.3 mm diameter\u003c\/li\u003e\n\u003cli\u003eLight suspension grade type suitable for regular driving conditions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman 521-555 suspension control arm and ball joint assembly is engineered to meet the suspension requirements of BMW 740i, 740iL, 750iL, and Z8 models. Constructed from high-strength steel with a casting and forging process, the control arm offers structural integrity and durability. The assembly comes pre-greased, eliminating the need for immediate maintenance after installation. Rubber bushings are included to reduce noise and absorb road vibrations, enhancing ride comfort. The ball joint is bolt-in mounted with a threaded stud, providing secure attachment and ease of replacement. This assembly is designed as a light suspension grade component, making it suitable for standard driving conditions without heavy load demands.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacement for worn or damaged control arms on BMW 740i, 740iL, 750iL, and Z8\u003c\/li\u003e\n\u003cli\u003eAddresses suspension noise caused by deteriorated bushings\u003c\/li\u003e\n\u003cli\u003eRestores proper wheel alignment and handling stability\u003c\/li\u003e\n\u003cli\u003eEliminates excessive play or looseness in the ball joint\u003c\/li\u003e\n\u003cli\u003eImproves overall suspension response and vehicle safety\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman 521-555 control arm and ball joint assembly requires basic suspension knowledge and appropriate tools. The bolt-in ball joint design simplifies replacement without the need for press tools. Ensure the mounting hole (12.3 mm diameter) aligns correctly with the vehicle’s frame. Since the ball joint is pre-greased, additional lubrication is not necessary at installation. Verify torque specifications according to BMW service guidelines to maintain safety and performance.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman suspension components are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-555 assembly undergoes rigorous quality control to ensure durability and reliability. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":51931944353973,"sku":"BKKY-521-555","price":64.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RB_521555_Fro.jpg?v=1775007875","url":"https:\/\/www.partcatalog.com\/products\/dorman-521-555-suspension-control-arm-and-ball-joint-assembly-rear-left-upper-rearward","provider":"PartCatalog","version":"1.0","type":"link"}