Home » AE86 OS Giken Super Lock 1.5-Way Limited Slip Differential | 4A-GE (1983-87 Corolla)
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OS Giken

AE86 OS Giken Super Lock 1.5-Way Limited Slip Differential | 4A-GE (1983-87 Corolla)

SKU: 808
$1,450.00
AE86 Version
Gear Oil
Fitment support available
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OS Giken Super Lock 1.5-Way Limited Slip Differential

For 1983–1987 Toyota Corolla AE86 Trueno / Levin and 1985–1987 U.S.-Market Corolla Sport AE86 (GT-S) with 4A-GE and manual transmission

Overview

The OS Giken Super Lock 1.5-Way Limited Slip Differential is a mechanical clutch-type rear LSD for 4A-GE-powered Toyota Corolla AE86 manual-transmission applications. Its patented pressure-ring design combines low initial preload with smooth, progressive locking, allowing the differential to remain composed during normal driving while increasing lock as drivetrain load rises.

The standard AE86 specification uses a 25/38 ramp configuration, 20 friction plates, 336 lock timing, and 10S preload. Separate Zenki and Kouki versions cover the early and late AE86 production ranges, and the correct version must be matched to the vehicle's actual rear-axle configuration.

Key Features

  • 1.5-way mechanical clutch-type limited slip differential
  • 25/38 ramp configuration
  • 20 friction plates
  • 336 lock timing
  • 10S preload
  • Low initial preload with progressive locking under load
  • Capable of progressively reaching full lock
  • Spline-through-side-gear design allows a high-capacity friction-plate arrangement
  • High-grade steel-alloy construction
  • Chemically heat-treated drivetrain components
  • Raw-forged gears
  • Precision-machined clutch discs
  • Billet-machined differential case
  • Separate Zenki and Kouki AE86 configurations

Progressive Super Lock Design

The Super Lock design uses a pressure-ring and lock-timing system that allows relatively free differential action at light load while progressively increasing locking force as torque is applied. This helps provide smooth low-speed operation and predictable traction as power is added.

The 20-plate clutch arrangement spreads load across a large friction area, while OS Giken's standard low-preload setup is designed to provide progressive locking without relying on high static preload.

Vehicle Fitment

Toyota Corolla AE86

  • 05/1983–09/1985 Trueno (JDM) — 4A-GE, manual transmission, Zenki / Early
  • 10/1985–04/1987 Trueno (JDM) — 4A-GE, manual transmission, Kouki / Late
  • 05/1983–09/1985 Levin (JDM) — 4A-GE, manual transmission, Zenki / Early
  • 10/1985–04/1987 Levin (JDM) — 4A-GE, manual transmission, Kouki / Late
  • 1985 GT-S (U.S.-Market) — 4A-GE, manual transmission, Zenki / Early
  • 1986–1987 GT-S (U.S.-Market) — 4A-GE, manual transmission, Kouki / Late

Fitment Notes

  • 4A-GE manual-transmission AE86 application only.
  • Zenki / Early: 05/1983–09/1985 production.
  • Kouki / Late: 10/1985–04/1987 production.
  • Both versions are designed for OEM open-differential axle shafts only.
  • Factory 4A-C / SR5 rear-axle applications are excluded.
  • If the rear axle or axle shafts have been swapped, match the LSD to the actual installed rear-axle configuration rather than exterior Zenki / Kouki appearance alone.

Product Specifications

Brand: OS Giken
Series: Super Lock
Product Type: Limited Slip Differential
Position: Rear
Differential Type: Mechanical Clutch-Type LSD
Configuration: 1.5-Way
Ramp Angles: 25/38
Total Friction Plates: 20
Lock Timing: 336
Preload: 10S
Locking Characteristic: Progressive, Up to Full Lock
Construction: High-Grade Steel Alloy
Gear Construction: Raw-Forged
Component Treatment: Chemical Heat Treatment
Case Construction: Billet-Machined
Drivetrain: RWD
Engine: 4A-GE
Transmission: Manual

Gear Oil & Service

OS Giken recommends a differential oil formulated for the Super Lock's negative-preload design. OS Giken OS-250R V2 80W-250 LSD Gear Oil is the current OS Giken mechanical-LSD fluid and is also available bundled with this differential.

The gear-oil bundle includes 2 liters total so the required oil can be ordered with the LSD in one configuration.

Which AE86 LSD Should I Choose?

LSD Best For Choose It If…
TOMEI T-TRAX Advance Aggressive street, track & drift You want quick, direct engagement with 1.5-way or 2-way options
CUSCO Type RS Street, touge & mixed motorsport You want low-initial-torque response with 1.5-way or 2-way options
OS Giken Super Lock Street & track You want smooth, progressive 1.5-way locking with refined low-load behavior

Available Configurations

Zenki / Early | 05/1983–09/1985 / LSD Only

  • OS Giken Super Lock 1.5-Way LSD

Zenki / Early | 05/1983–09/1985 / LSD + 2L OS-250R V2 Gear Oil

  • OS Giken Super Lock 1.5-Way LSD plus 2 liters of OS-250R V2 gear oil

Kouki / Late | 10/1985–04/1987 / LSD Only

  • OS Giken Super Lock 1.5-Way LSD

Kouki / Late | 10/1985–04/1987 / LSD + 2L OS-250R V2 Gear Oil

  • OS Giken Super Lock 1.5-Way LSD plus 2 liters of OS-250R V2 gear oil