{"product_id":"os-giken-super-lock-lsd-toyota-ae86-4age","title":"AE86 OS Giken Super Lock 1.5-Way Limited Slip Differential (Corolla 1983-1987)","description":"\u003ch2 class=\"PDq2pG_selectionAnchorContainer\"\u003eOS Giken Super Lock 1.5-Way Limited Slip Differential\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFor 1983–1987 Toyota Corolla AE86 4A-GE Manual Transmission Models with T-Series Rear Differential\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eOS Giken Super Lock Limited Slip Differential\u003c\/strong\u003e is a premium mechanical clutch-type LSD for Toyota AE86 4A-GE applications. Designed to provide strong rear-wheel traction without the abrupt, noisy behavior associated with many conventional clutch-type differentials, the Super Lock combines low initial preload with smooth, progressive locking under power.\u003c\/p\u003e\n\u003cp\u003eThe standard AE86 configuration uses a \u003cstrong\u003e1.5-way 25\/38 ramp design with 20 friction plates\u003c\/strong\u003e and can progressively reach full lock as drivetrain load increases. This provides predictable power delivery during corner exit, acceleration, spirited street driving, track use, and performance driving while retaining surprisingly civilized low-speed behavior.\u003c\/p\u003e\n\u003cp\u003eSeparate \u003cstrong\u003eZenki and Kouki configurations\u003c\/strong\u003e are available because early and late AE86 T-Series rear axles use different axle spline dimensions. Selecting the correct version for the vehicle's production date and actual rear axle configuration is critical.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePremium mechanical clutch-type limited slip differential\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1.5-way standard configuration\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e25\/38 ramp configuration\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e20 friction plates\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eProgressive locking with up to full lock under load\u003c\/li\u003e\n\u003cli\u003eLow initial preload for smooth low-speed operation\u003c\/li\u003e\n\u003cli\u003eDesigned to reduce chatter and abrupt engagement compared with more aggressively preloaded clutch LSDs\u003c\/li\u003e\n\u003cli\u003eSpline-through-side-gear design allows a high-capacity friction plate arrangement\u003c\/li\u003e\n\u003cli\u003eHigh-grade steel alloy construction\u003c\/li\u003e\n\u003cli\u003eChemically heat-treated drivetrain components\u003c\/li\u003e\n\u003cli\u003eRaw-forged gears for increased strength\u003c\/li\u003e\n\u003cli\u003ePrecision-machined clutch plates\u003c\/li\u003e\n\u003cli\u003eBillet-machined differential case\u003c\/li\u003e\n\u003cli\u003eSeparate Zenki and Kouki versions for the correct AE86 axle configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eProgressive Super Lock Design\u003c\/h2\u003e\n\u003cp\u003eThe Super Lock differs from a conventional high-preload clutch LSD by using a pressure-ring and lock-timing system that allows relatively free differential action during light-load driving while progressively increasing lock as torque is applied.\u003c\/p\u003e\n\u003cp\u003eThis allows the differential to remain smooth and predictable during parking, low-speed turns, and normal street driving while delivering substantially stronger lock when accelerating out of a corner or applying power aggressively.\u003c\/p\u003e\n\u003cp\u003eThe high-capacity 20-plate arrangement distributes load across a greater friction area, helping provide consistent lock characteristics, durability, and heat management during repeated performance use.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eToyota Corolla Levin \/ Sprinter Trueno\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e05\/1983–09\/1985 Toyota Corolla Levin \/ Sprinter Trueno – \u003cstrong\u003eAE86 Zenki – RWD – 4A-GE – Manual Transmission – T-Series Rear Differential\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e10\/1985–04\/1987 Toyota Corolla Levin \/ Sprinter Trueno – \u003cstrong\u003eAE86 Kouki – RWD – 4A-GE – Manual Transmission – T-Series Rear Differential\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eToyota Corolla Sport GT-S\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1985 Toyota Corolla Sport GT-S – \u003cstrong\u003eAE86 Zenki – RWD – 4A-GE – Manual Transmission – Early T-Series Rear Differential\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e1985–1987 Toyota Corolla Sport GT-S – \u003cstrong\u003eAE86 Kouki – RWD – 4A-GE – Manual Transmission – Late T-Series Rear Differential\u003c\/strong\u003e, when equipped with the later production axle configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFitment Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eFor 4A-GE \/ 4AG manual-transmission AE86 applications\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eRequires the factory-style T-Series rear differential configuration\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDoes not fit the factory 4A-C \/ SR5 rear differential configuration\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eZenki and Kouki differential centers are \u003cstrong\u003enot interchangeable with mismatched axle splines\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eZenki \/ early configuration applies to \u003cstrong\u003e05\/1983–09\/1985 production\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eKouki \/ late configuration applies to \u003cstrong\u003e10\/1985–04\/1987 production\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEarly Zenki applications use the smaller \u003cstrong\u003e24 mm \/ 23-spline\u003c\/strong\u003e axle configuration\u003c\/li\u003e\n\u003cli\u003eLater Kouki applications use the larger \u003cstrong\u003e25.4 mm \/ 23-spline\u003c\/strong\u003e axle configuration\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDo not select solely by exterior Zenki\/Kouki appearance if the rear axle has been swapped\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eVerify the actual rear axle and production date before ordering\u003c\/li\u003e\n\u003cli\u003eProper differential bearing preload, backlash, and ring-and-pinion setup are required during installation\u003c\/li\u003e\n\u003cli\u003eProfessional differential installation is strongly recommended\u003c\/li\u003e\n\u003cli\u003eUse \u003cstrong\u003eOS-250R V2 or another OS Giken-approved differential oil\u003c\/strong\u003e for proper break-in and locking performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e OS Giken\u003cbr\u003e\u003cstrong\u003eSeries:\u003c\/strong\u003e Super Lock\u003cbr\u003e\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Mechanical Limited Slip Differential\u003cbr\u003e\u003cstrong\u003ePosition:\u003c\/strong\u003e Rear\u003cbr\u003e\u003cstrong\u003eDifferential Type:\u003c\/strong\u003e Clutch-Type LSD\u003cbr\u003e\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 1.5-Way\u003cbr\u003e\u003cstrong\u003eRamp Angles:\u003c\/strong\u003e 25\/38\u003cbr\u003e\u003cstrong\u003eTotal Friction Plates:\u003c\/strong\u003e 20\u003cbr\u003e\u003cstrong\u003eLock Timing:\u003c\/strong\u003e 336\u003cbr\u003e\u003cstrong\u003ePreload:\u003c\/strong\u003e 10S\u003cbr\u003e\u003cstrong\u003eLocking Capability:\u003c\/strong\u003e Progressive Up to Full Lock\u003cbr\u003e\u003cstrong\u003eConstruction:\u003c\/strong\u003e High-Grade Steel Alloy\u003cbr\u003e\u003cstrong\u003eGear Construction:\u003c\/strong\u003e Raw-Forged\u003cbr\u003e\u003cstrong\u003eComponent Treatment:\u003c\/strong\u003e Chemical Heat Treatment\u003cbr\u003e\u003cstrong\u003eCase Construction:\u003c\/strong\u003e Billet-Machined\u003cbr\u003e\u003cstrong\u003eDrivetrain:\u003c\/strong\u003e Rear-Wheel Drive\u003cbr\u003e\u003cstrong\u003eEngine Application:\u003c\/strong\u003e 4A-GE \/ 4AG\u003cbr\u003e\u003cstrong\u003eTransmission:\u003c\/strong\u003e Manual\u003cbr\u003e\u003cstrong\u003eRear Differential:\u003c\/strong\u003e Toyota T-Series\u003c\/p\u003e\n\u003chr\u003e\n\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-8 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\"\u003e\n\u003ch2 class=\"PDq2pG_selectionAnchorContainer\"\u003eOS Giken Super Lock vs. CUSCO Type RS\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eOS Giken Super Lock\u003c\/strong\u003e is the more premium, refinement-focused choice for an AE86 that sees a mix of \u003cstrong\u003estreet driving, touge, grip, autocross, and track use\u003c\/strong\u003e. Its 20-plate clutch design uses relatively low initial preload and progressively increases locking force as load rises, providing strong traction under power while retaining smooth low-speed differential action. This makes it especially appealing for owners who want serious LSD performance without excessive chatter or abrupt engagement during normal driving. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003ca rel=\"noopener\" class=\"decorated-link cursor-pointer\"\u003e\u003cstrong\u003eCUSCO Type RS Limited Slip Differential\u003c\/strong\u003e\u003c\/a\u003e is the more configurable alternative. CUSCO's RS coil-spring system also uses low initial torque for responsive, progressive engagement, while offering \u003cstrong\u003e1.5-way and 2-way configurations\u003c\/strong\u003e on the Zenki application\u003cstrong\u003e.\u003c\/strong\u003e The 1.5-way setup is well suited to street, touge, grip, and circuit driving, while the 2-way configuration provides more consistent locking during both acceleration and deceleration for drift-oriented or more aggressive driving styles. Preserve Rad currently offers the \u003ca href=\"https:\/\/preserverad.com\/products\/cusco-type-rs-1-5-way-2-way-lsd-ae86-zenki?_pos=7\u0026amp;_sid=de2847663\u0026amp;_ss=r\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eZenki Type RS\u003c\/strong\u003e\u003c\/a\u003e with 1.5-way and 2-way choices, while the \u003cstrong\u003e\u003ca href=\"https:\/\/preserverad.com\/products\/cusco-type-rs-1-5-way-rear-lsd-1986-1987-toyota-ae86-gts?_pos=9\u0026amp;_sid=de2847663\u0026amp;_ss=r\" rel=\"noopener\" target=\"_blank\"\u003eKouki CUSCO Type RS\u003c\/a\u003e \u003c\/strong\u003e1.5-Way LSD covers the later AE86 rear axle configuration. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChoose the OS Giken Super Lock for maximum refinement, progressive locking, and a premium street\/track balance. Choose the CUSCO Type RS when greater setup flexibility—particularly the availability of a 2-way configuration for Zenki cars—is more important. Both are high-quality clutch-type LSD upgrades; the better choice depends primarily on how aggressively the AE86 will be driven and how much deceleration-side locking the driver wants.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003ch2\u003eZenki vs. Kouki – Which Version Do You Need?\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eZenki \/ Early version\u003c\/strong\u003e is designed for AE86s produced from \u003cstrong\u003eMay 1983 through September 1985\u003c\/strong\u003e. These cars use the smaller early T-Series axle spline configuration.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eKouki \/ Late version\u003c\/strong\u003e is designed for AE86s produced from \u003cstrong\u003eOctober 1985 through April 1987\u003c\/strong\u003e and uses the larger late T-Series axle spline configuration.\u003c\/p\u003e\n\u003cp\u003eThe two versions share the same \u003cstrong\u003e1.5-way Super Lock design, 20-plate clutch pack, 25\/38 ramp configuration, lock timing, and preload specification\u003c\/strong\u003e. The difference is the axle-side fitment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf the rear axle has ever been replaced or converted, select the LSD according to the actual axle configuration rather than the vehicle's model year or exterior appearance.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAvailable Configurations\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eZenki \/ Early – 05\/1983–09\/1985 Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEarly AE86 T-Series rear differential\u003c\/li\u003e\n\u003cli\u003e24 mm \/ 23-spline axle configuration\u003c\/li\u003e\n\u003cli\u003e1.5-way Super Lock LSD\u003c\/li\u003e\n\u003cli\u003e(1) Limited slip differential center\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eKouki \/ Late – 10\/1985–04\/1987 Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLate AE86 T-Series rear differential\u003c\/li\u003e\n\u003cli\u003e25.4 mm \/ 23-spline axle configuration\u003c\/li\u003e\n\u003cli\u003e1.5-way Super Lock LSD\u003c\/li\u003e\n\u003cli\u003e(1) Limited slip differential center\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OS Giken","offers":[{"title":"Zenki \/ Early | 05\/1983–09\/1985 \/ LSD Only","offer_id":53466530382133,"sku":"808","price":1450.0,"currency_code":"USD","in_stock":true},{"title":"Zenki \/ Early | 05\/1983–09\/1985 \/ LSD + 2L OS-250R V2 Gear Oil","offer_id":53466640941365,"sku":"812","price":1550.0,"currency_code":"USD","in_stock":true},{"title":"Kouki \/ Late | 10\/1985–04\/1987 \/ LSD Only","offer_id":53466530414901,"sku":"809","price":1450.0,"currency_code":"USD","in_stock":true},{"title":"Kouki \/ Late | 10\/1985–04\/1987 \/ LSD + 2L OS-250R V2 Gear Oil","offer_id":53466640974133,"sku":"813","price":1550.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/6005\/8421\/files\/1logos_1_ec2da689-a621-4048-89d4-fd8e197a36a4.png?v=1788650501","url":"https:\/\/preserverad.com\/products\/os-giken-super-lock-lsd-toyota-ae86-4age","provider":"Preserve Rad","version":"1.0","type":"link"}