Acura Legend 3.5 Manual Diff

The Acura Legend 3.5 Manual Differential is a critical drivetrain component for the 3.5L manual transmission variant of the Acura Legend luxury sedan. This differential assembly provides torque distribution to the wheels while allowing for speed differences during cornering, featuring limited-slip functionality, specific gear ratios, and robust construction for performance driving. Below are key sections covering specifications, installation, maintenance, troubleshooting, and compatibility.

1. Differential Specifications 2. Installation Procedures 3. Maintenance Schedule 4. Fluid Requirements 5. Troubleshooting Common Issues 6. Compatibility Information 7. Performance Upgrades 8. Safety Precautions 9. Warranty Information

Differential Specifications

Key technical details: Limited-slip differential assembly with specific gear ratios and torque capacity.

Specification	Details
Gear Ratio	4.066:1 (standard for 3.5L manual models)
Type	Torsen limited-slip differential
Torque Capacity	Up to 320 lb-ft
Fluid Capacity	1.8 quarts (1.7 liters)
Weight	85 lbs (38.5 kg) complete assembly
Bolt Pattern	6-bolt output flanges
Case Material	Aluminum alloy housing
Compatible Years	1991-1995 Acura Legend 3.5L Manual

Installation Procedures

Proper installation requires specific tools and safety procedures.

Vehicle Preparation: Secure vehicle on lift or jack stands, remove rear wheels.
Drain Fluid: Remove drain plug, collect old differential fluid properly.
Driveshaft Removal: Unbolt driveshaft from differential flange, support securely.
Axle Removal: Remove axle shafts from differential outputs.
Mounting Removal: Unbolt differential from subframe (6 bolts, 17mm).
New Unit Installation: Position new differential, torque mounting bolts to 65 ft-lbs.
Reassembly: Reinstall axles, driveshaft, fill with specified fluid.

WARNING! Use proper jack stands; differential is heavy - use transmission jack for safety.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Fluid Change: Every 30,000 miles or 2 years - use Honda/Acura Dual Pump II fluid.
Inspection: Check for leaks every oil change, inspect mounting bolts.
Bushing Check: Inspect differential bushings every 60,000 miles for wear.
Seal Replacement: Output shaft seals should be replaced if leaking.

CAUTION! Always use specified fluid; incorrect fluid can damage limited-slip components.

Fluid Requirements

Recommended Fluid: Honda/Acura Dual Pump II Hypoid Gear Oil
Viscosity: 75W-85
Capacity: 1.8 US quarts (1.7 liters)
Change Interval: 30,000 miles or 2 years
Alternative: Mobil 1 Synthetic Gear Lubricant LS 75W-90
Special Additives: Contains limited-slip friction modifiers

Troubleshooting Common Issues

Diagnosing differential problems requires systematic approach.

Symptom	Possible Cause	Corrective Action
Whining noise	Worn gear teeth/low fluid	Check fluid level; inspect gears for wear
Clunking on acceleration	Worn spider gears/mounts	Inspect differential mounts; check internal gears
Vibration	Imbalanced driveshaft/worn U-joints	Balance driveshaft; replace U-joints if necessary
Fluid leaks	Worn seals/gasket	Replace output shaft seals; reseal housing
Limited-slip not functioning	Worn clutch packs/incorrect fluid	Use correct fluid; rebuild limited-slip unit

Compatibility Information

Specific model applications and interchangeability.

Direct Fit: 1991-1995 Acura Legend L/LS with 3.5L manual transmission
Interchangeable: 1992-1995 Acura Legend GS 3.5L manual models
Not Compatible: Automatic transmission models (different ratio)
Aftermarket: Some aftermarket LSD units available for performance upgrades

Note: Verify VIN and production date before purchasing replacement unit.

Performance Upgrades

Enhancements for improved performance and durability.

Aftermarket LSD: Torsen-type or clutch-type limited-slip upgrades
Gear Ratio Changes: Available in 4.266:1 for improved acceleration
Cooling: Differential cooler kits for track use
Bushing Upgrades: Polyurethane bushings for reduced deflection
Finned Cover: Aluminum finned covers for improved heat dissipation

WARNING! Performance modifications may affect warranty and drivability.

Safety Precautions

Critical safety information for handling and maintenance.

Always use jack stands - never work under vehicle supported only by jack
Wear safety glasses when draining fluid or removing components
Use proper lifting equipment for differential (85+ lbs)
Disconnect battery before beginning any work
Allow differential to cool before fluid changes

Warranty Information

Original equipment and replacement part coverage.

Original Manufacturer Warranty: 3 years/36,000 miles from date of vehicle purchase. Aftermarket Replacement: Varies by manufacturer (typically 1 year/12,000 miles). Labor not included unless installed by authorized dealer. Keep receipts and maintenance records for warranty claims.