1986 Toyota Supra Manual Transmission

The 1986 Toyota Supra features a 5-speed manual transmission (W58) designed for smooth shifting and optimal performance. This transmission is paired with the 2.8L 5M-GE inline-6 engine, providing reliable power delivery and engaging driving dynamics. Below are key sections covering specifications, operation, maintenance, troubleshooting, and repair procedures.

1. Transmission Specifications 2. Shifting Operation 3. Fluid Requirements 4. Clutch System 5. Maintenance Schedule 6. Common Issues 7. Troubleshooting 8. Repair Procedures 9. Performance Tips 10. Warranty Information

Transmission Specifications

The W58 5-speed manual transmission features all-synchro design with overdrive 5th gear.

Specification	Details
Transmission Type	5-speed manual (W58)
Gear Ratios	1st: 3.285, 2nd: 1.894, 3rd: 1.275, 4th: 1.000, 5th: 0.783
Final Drive Ratio	3.73:1
Fluid Capacity	2.2 quarts (2.1 liters)
Fluid Type	75W-90 GL-4 or GL-5 gear oil
Shift Pattern	H-pattern with reverse left and up
Synchromesh	All forward gears
Case Material	Aluminum alloy
Weight	Approximately 75 lbs (34 kg)

Shifting Operation

Proper shifting technique ensures smooth operation and extends transmission life.

Fully depress clutch pedal before shifting gears.
Move shift lever smoothly through gear pattern.
Release clutch pedal gradually while applying throttle.
Use rev-matching for downshifts to reduce synchro wear.
Never force the shifter into gear.

WARNING! Avoid riding the clutch or resting hand on shifter while driving.

Fluid Requirements

Proper fluid maintenance is critical for transmission longevity.

Check fluid level every 15,000 miles or 12 months.
Use only 75W-90 GL-4 or GL-5 gear oil.
Change fluid every 30,000 miles under normal conditions.
Drain and refill when fluid appears dark or contaminated.

CAUTION! Use only specified gear oil; incorrect fluid can damage synchros.

Clutch System

Clutch Type: Single dry disc with diaphragm spring.
Clutch Fluid: DOT 3 brake fluid.
Pedal Free Play: 0.2-0.6 inches (5-15mm).
Master Cylinder: 0.625 inch bore.
Slave Cylinder: 0.75 inch bore.
Clutch Disc Diameter: 225mm.
Release Bearing: Hydraulic actuation.

Maintenance Schedule

Regular maintenance ensures optimal transmission performance.

Service	Interval	Procedure
Fluid Check	15,000 miles	Inspect level and condition
Fluid Change	30,000 miles	Drain and refill with new gear oil
Clutch Fluid	30,000 miles	Bleed and replace DOT 3 fluid
Shift Linkage	15,000 miles	Lubricate pivot points
Clutch Adjustment	As needed	Check and adjust pedal free play

Common Issues

Typical problems encountered with the W58 transmission.

Grinding during shifts - worn synchros or low fluid
Difficulty engaging gears - clutch hydraulic issues
Transmission noise - bearing wear or gear damage
Fluid leaks - worn seals or gaskets
Stuck in gear - shift linkage problems

Tip: Address issues promptly to prevent further damage.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Grinding in 2nd/3rd gear	Worn synchros	Replace synchro assembly; check fluid level
Hard shifting when cold	Wrong fluid viscosity	Drain and refill with proper 75W-90 oil
Clutch pedal stays down	Master/slave cylinder failure	Replace faulty cylinder; bleed system
Transmission whine	Worn bearings	Inspect and replace input/output shaft bearings
Fluid on garage floor	Leaking seals	Replace input shaft seal or extension housing seal

Repair Procedures

Basic repair steps for common transmission issues.

Fluid change: Remove drain plug, drain fluid, refill through fill plug.
Clutch replacement: Remove transmission, replace clutch components.
Seal replacement: Remove driveshaft and output flange, replace seal.
Shift linkage adjustment: Loosen locknuts, adjust rod length, retighten.
Bearing replacement: Requires transmission disassembly.

WARNING! Transmission removal requires proper equipment and expertise.

Performance Tips

Enhance driving experience and transmission longevity.

Allow transmission to warm up in cold weather before aggressive driving
Use double-clutching technique for smoother downshifts
Avoid "power shifting" to prevent gear damage
Regularly check transmission mount condition
Consider synthetic gear oil for improved cold-weather performance

Warranty Information

Original warranty coverage and service information.

1986 Toyota Supra transmission covered by 5-year/60,000-mile powertrain warranty from original purchase date. Contact Toyota dealership for warranty verification. For technical support, visit www.toyota.com or contact 1-800-331-4331. Keep maintenance records for warranty claims.