{"product_id":"os-giken-mazda-fc3s-rx7-na-mt-only-miata-na8-nb8-mt-only-super-lock-lsd","title":"OS Giken Mazda FC3S RX7 NA (MT Only) \/ Miata NA8\/NB8 (MT Only) Super Lock LSD","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e MZ072-HA \u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eOS Giken Mazda FC3S RX7 NA (MT Only) \/ Miata NA8\/NB8 (MT Only) Super Lock LSD\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe OS Giken MZ072-HA Super Lock LSD is a helical gear limited slip differential built for Mazda FC3S RX-7 NA manual transmission models from 1986 to 1991 and Miata NA8 from 1994 to 1997 plus NB8 from 1999 to 2000 manual transmissions. This 2-way LSD locks both wheels instantly under acceleration and deceleration for sharper cornering and faster lap times. Its clutchless design ensures reliable performance without adjustments or rebuilds.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelical Gear Mechanism:\u003c\/strong\u003e Delivers smooth progressive traction control without clutch plates that wear out over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorque Bias Ratio:\u003c\/strong\u003e Starts at 3:1 initial and reaches 6:1 maximum for balanced power delivery to both rear wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWPC Gear Treatment:\u003c\/strong\u003e Boosts gear surface strength by 30 percent while cutting friction and rotational inertia for quicker response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4340 Alloy Steel Gears:\u003c\/strong\u003e Forged side and pinion gears handle high torque loads from track days and spirited drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e Reduces unsprung weight compared to stock diffs for improved handling and suspension feel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eManual transmission models only. not compatible with automatics.\u003c\/li\u003e\n\u003cli\u003eRequires LSD-specific gear oil like 75W-85 GL-5 full synthetic for optimal operation.\u003c\/li\u003e\n\u003cli\u003eArrives fully assembled ready for installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eBolt-in replacement for factory open differential. matches OEM mounting points.\u003c\/li\u003e\n\u003cli\u003eCompatible with stock ring and pinion ratios or aftermarket setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1986-1991\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eRX-7\u003c\/td\u003e\n\u003ctd\u003eFC3S NA (MT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1979-1985\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eRX-7\u003c\/td\u003e\n\u003ctd\u003eS, GS, GSL, GSL-SE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1983\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eRX-7\u003c\/td\u003e\n\u003ctd\u003eLimited Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1990-1997\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eMiata\u003c\/td\u003e\n\u003ctd\u003eBase, SE, M Edition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1993-1997\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eMiata\u003c\/td\u003e\n\u003ctd\u003eLE, STO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2005\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eMiata\u003c\/td\u003e\n\u003ctd\u003eBase, 10th Anniversary, LS, SE, Shinsen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose OS Giken?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRacing pedigree from D1GP drift series and Super GT championships.\u003c\/li\u003e\n\u003cli\u003eHand-assembled in Japan with tight tolerances for consistent operation.\u003c\/li\u003e\n\u003cli\u003eEngineered to endure repeated hard launches and high-speed corners.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Will this fit manual transmission Miata NA8 and NB8 models?\u003cbr\u003e\n \u003cstrong\u003eA:\u003c\/strong\u003e Yes, direct fit for 1994-1997 NA8 and 1999-2000 NB8 with 5-speed manual. confirms traction upgrade for rear-wheel drive setups.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What materials and treatments are used on the gears?\u003cbr\u003e\n \u003cstrong\u003eA:\u003c\/strong\u003e Forged 4340 chromoly steel with WPC micro-peening for fatigue resistance and smooth engagement.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What warranty covers this LSD and any install tips?\u003cbr\u003e\n \u003cstrong\u003eA:\u003c\/strong\u003e Backed by 1-year manufacturer warranty against defects. Use a lift and torque specs from service manual during install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground \/ FedEx Ground\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock - ships same or next business day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Heavy-duty box measuring 20in x 16in x 12in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 42 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OS Giken","offers":[{"title":"Default Title","offer_id":44302613774415,"sku":"OSGMZ072-HA","price":1450.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/os-giken-mazda-fc3s-rx7-na-mt-only-miata-na8nb8-mt-only-super-lock-lsd-os-giken-2.jpg?v=1767725325","url":"https:\/\/www.blackopsautoworks.com\/products\/os-giken-mazda-fc3s-rx7-na-mt-only-miata-na8-nb8-mt-only-super-lock-lsd","provider":"Black Ops Auto Works","version":"1.0","type":"link"}