Lexus LS 1989-1994 Drivetrain Specifications

The 1989-1994 Lexus LS features a rear-wheel-drive (RWD) system with a 4.0L V8 engine (1UZ-FE) paired with a 4-speed automatic transmission. The drivetrain is designed for smooth power delivery and durability. It is compatible with OEM parts and select aftermarket components. The differential ratio is 3.769:1, ensuring optimal performance for both city and highway driving.

Regular maintenance includes checking and replacing transmission fluid every 60,000 miles, inspecting the driveshaft and differential for wear, and ensuring proper lubrication of U-joints. The timing belt should be replaced every 90,000 miles. Regularly inspect the CV joints and axles for damage, and ensure the alignment and balance of the drivetrain components to prevent premature wear.

To replace the driveshaft, first, secure the vehicle on a lift or jack stands. Remove the exhaust system and heat shields for access. Unbolt the driveshaft from the differential and transmission. Mark the driveshaft orientation for proper reinstallation. Install the new driveshaft, ensuring all bolts are torqued to factory specifications. Reassemble the exhaust system and test for proper operation.

Common issues include transmission fluid leaks, worn U-joints, and differential noise. Diagnose leaks by inspecting seals and gaskets. Worn U-joints may cause vibrations and require replacement. Differential noise often indicates worn bearings or insufficient lubrication. Regular inspections and timely repairs can prevent major drivetrain failures.

To optimize performance, use high-quality synthetic transmission and differential fluids. Upgrade to performance driveshafts or lightweight components for improved responsiveness. Ensure proper alignment and balance of drivetrain parts. Regularly inspect and replace worn components. Consider a performance tune to enhance power delivery and efficiency.