Infiniti M45 2003-2004 Drivetrain Specifications

The 2003-2004 Infiniti M45 features a rear-wheel-drive (RWD) system powered by a 4.5L V8 engine producing 340 horsepower and 333 lb-ft of torque. It is paired with a 5-speed automatic transmission. The drivetrain is designed for smooth performance and is compatible with standard Infiniti parts. Always verify compatibility with your specific model year and trim before purchasing replacement components.

Regular maintenance for the Infiniti M45 drivetrain includes checking and replacing transmission fluid every 30,000-60,000 miles, inspecting the driveshaft and differential for wear, and ensuring proper alignment. Lubricate universal joints and inspect CV joints if applicable. Follow the manufacturer’s maintenance schedule in the owner’s manual for optimal performance and longevity.

To replace the driveshaft, safely lift the vehicle and secure it on jack stands. Remove the exhaust system and heat shields for access. Unbolt the driveshaft from the differential and transmission. Mark the orientation of the driveshaft for proper reinstallation. Install the new driveshaft, ensuring all bolts are torqued to the manufacturer’s specifications. Reassemble the exhaust system and test drive the vehicle.

Common drivetrain issues include vibrations during acceleration, which may indicate a worn driveshaft or unbalanced components. Unusual noises from the differential or transmission could signal low fluid levels or internal damage. Check for leaks, inspect mounts, and ensure proper lubrication. If issues persist, consult a professional mechanic for a detailed diagnosis.

To optimize drivetrain performance, use high-quality synthetic transmission and differential fluids. Ensure proper alignment and balance of drivetrain components. Upgrade to performance driveshafts or differentials if desired. Regularly inspect and maintain all components to prevent wear and tear. Avoid aggressive driving to reduce stress on the drivetrain.