Lexus GX 2003-2009 Drivetrain Specifications

The 2003-2009 Lexus GX features a full-time 4WD system with a Torsen limited-slip center differential. It is powered by a 4.7L V8 engine producing 263-270 hp and 323-329 lb-ft of torque, paired with a 5-speed automatic transmission. The drivetrain includes a 2-speed transfer case with high and low ranges, offering a towing capacity of up to 6,500 lbs. It is compatible with 18-inch wheels and features a ground clearance of 8.1 inches.

Regular maintenance for the Lexus GX drivetrain includes checking and replacing the transfer case and differential fluids every 30,000-60,000 miles. Inspect the driveshaft and CV joints for wear and tear, and ensure proper lubrication. Replace the transmission fluid every 60,000-100,000 miles. Regularly check the 4WD system for proper operation and address any unusual noises or vibrations promptly.

To replace drivetrain components, first, lift the vehicle securely on a jack stand. Remove the skid plates and disconnect the driveshaft. Drain the transfer case and differential fluids. Unbolt and remove the old components, ensuring proper alignment. Install new components, refill fluids, and reconnect the driveshaft. Test the system for proper operation and check for leaks before driving.

Unusual noises from the drivetrain may indicate worn CV joints, a failing driveshaft, or low fluid levels. Inspect the CV joints for cracks or leaks and check the driveshaft for damage. Ensure transfer case and differential fluids are at the correct levels. If the issue persists, consult a professional mechanic for a thorough diagnosis and repair.

To optimize drivetrain performance, use high-quality synthetic fluids for the transfer case and differentials. Regularly inspect and maintain the 4WD system, ensuring proper lubrication and alignment. Upgrade to performance-oriented tires and consider installing a heavy-duty driveshaft for off-road use. Avoid excessive towing loads and perform regular system checks to ensure optimal operation.