Does the 2004 Lexus GX470 have a timing belt or chain?

The 2004 Lexus GX470 uses a timing chain, not a timing belt.

In detail, the GX470 is powered by the 4.7-liter 2UZ-FE V8 and drives its camshafts with a timing-chain arrangement. Timing chains are designed to last for the life of the engine under normal maintenance, so there’s no scheduled belt replacement. However, wear in the chain, guides, or tensioners can develop over time, potentially causing a rattling noise or timing irregularities. Regular maintenance—most notably consistent oil changes with the correct viscosity—helps keep the chain-driven system healthy and reduces the risk of tensioner or guide wear.

Timing systems: belt versus chain

Before examining specifics for the GX470, it helps to understand how timing belts and timing chains differ in practice and what that means for owners.

• Durability and maintenance: Timing chains typically last longer and do not require a scheduled replacement like timing belts. They rely on oil pressure for tensioner function, so engine oil quality matters.


• Replacement interval and cost: Belts have defined replacement intervals (often around 60,000–100,000 miles) and are generally cheaper to replace than a full chain/tensioner/guide service, which is more labor-intensive.


• Reliability and failure mode: Chains are less prone to sudden failure than belts, but a worn chain or failed tensioner can cause timing misalignment and potential engine damage if not addressed.


• Noise: A failing timing chain tensioner or worn guides can produce a rattling or clattering sound, particularly on cold starts or at idle.

In summary, for the GX470, the timing system is chain-driven, which translates to fewer routine replacement intervals but a greater emphasis on oil-maintenance and listening for wear-related noises that indicate tensioner or guide issues.

Notes for GX470 maintenance and common concerns

Owners should be aware of practical maintenance considerations and what to monitor to keep the chain-driven system in good condition.

• Oil quality and changes: Use the manufacturer-recommended oil grade and keep up with regular changes to ensure the tensioner and guides receive proper lubrication.


• Noise monitoring: If you hear a new rattle from the front of the engine, especially on cold starts, have the timing chain area inspected promptly.


• Preventive care: While not routinely replaced on schedule, some owners choose to inspect or replace the chain, guides, and tensioner as part of major service around high mileage, or when planning other front-of-engine maintenance (e.g., water pump).


• Related components: When servicing the timing chain area, it’s common to assess associated components such as the water pump and seals, since they reside in the same front cover area and labor is involved in access.

Bottom line: The GX470’s 2UZ-FE engine uses a timing chain, not a belt. Regular oil maintenance is the best preventative measure, and unusual engine noises or performance changes should prompt a professional inspection of the chain, guides, and tensioner.

Summary

In short, the 2004 Lexus GX470 features a timing-chain drive rather than a timing belt. Chains are designed to last the life of the engine under normal use, but they depend on proper oil maintenance and can wear out tensioners or guides over time. Listening for rattles, staying current on oil changes, and addressing any unusual engine noise promptly are the best ways to keep this chain-driven system healthy.

What year to avoid Lexus GX470?

The 2003 Lexus GX470 is often cited as the worst model year due to drivetrain issues like clunking noises, and the 2006 model also received a high number of complaints, particularly for drivetrain problems. Other years to be cautious about include models with the optional KDSS system for off-road enthusiasts due to potential costs, and early models (2004 and 2005) for dashboard cracks, dry-rotted wheels, and less engine power compared to later models. 
You can watch this video to learn about common problems to look for when buying a Lexus GX470: 52sRob DrivesYouTube · Feb 11, 2021
Specific model years to be cautious about

• 2003 Lexus GX470: Considered the worst model year by some sources due to specific drivetrain issues, such as clunking and squealing noises, and higher repair costs. 
• 2006 Lexus GX470: Received a high number of owner complaints, particularly regarding drivetrain problems. 
• Models with KDSS: If you plan to heavily modify the vehicle for off-roading, models with the Kinetic Dynamic Suspension System (KDSS) may be best to avoid due to potential complexity and cost of repairs or modifications. 

Common issues across the GX470 lifespan

• Drivetrain issues: Reports of clunking and squealing noises have been associated with certain model years. 
• Dashboard cracks: A common and potentially expensive issue across many model years, especially in warmer climates. 
• Timing belt and water pump: A crucial maintenance item. The timing belt should be replaced around every 90,000 miles, or the vehicle should have a documented history of this replacement. 
• Navigation system: The built-in navigation system is outdated and can be difficult to upgrade or repair. Many owners recommend using a smartphone for navigation instead. 
• Suspension and transmission: During a test drive, listen for unusual noises from the suspension and check for smooth transmission shifts, as these can indicate wear. 

This video discusses the maintenance of a Lexus GX470, including the timing belt replacement: 58sCar WizardYouTube · Feb 22, 2022

What is the life expectancy of a 2004 Lexus GX470?

A 2004 Lexus GX470 can have a life expectancy of 200,000 to 300,000 miles or more, with some owners reporting even higher mileage, thanks to its reliable 4.7L V8 engine and robust drivetrain. Its longevity depends on consistent maintenance, such as replacing the timing belt and water pump, as well as checking for common issues like rust, worn CV joints, and air suspension problems. 
Factors affecting life expectancy

• Maintenance is key: Following the manufacturer's recommended maintenance schedule is crucial for extending the vehicle's service life. Key services include timing belt and water pump replacement and regular fluid changes for the engine, transmission, and differentials. 
• Engine and drivetrain: The 4.7L V8 engine is known for its durability, and the full-time four-wheel drive system with a locking center differential is robust. Some owners have reported keeping the original engine and transmission for well over 300,000 miles. 
• Potential issues:
  • Air suspension: The factory air suspension system is a common area for failure, often requiring replacement around the 150,000 to 200,000-mile mark. 
  • Rust: While the GX470 is generally well-built, it's important to check for rust, especially if the vehicle has been driven in areas with road salt. 
  • Other components: Other potential issues to monitor include CV joints, frame bushings, and front struts. 
  • Dashboard: Early models like the 2004 are known for dashboards that can melt or crack and should be replaced under a service campaign if not already done. 

What to look for

• Maintenance records: Prioritize vehicles with a comprehensive service history that shows the timing belt and water pump have been replaced. 
• Overall condition: Inspect the vehicle's interior and exterior for signs of wear and tear that can indicate how well it was cared for. 
• Mileage: A higher mileage vehicle is not necessarily a poor choice if it has been meticulously maintained. Many owners have achieved over 300,000 miles on their GX470s. 

How much does it cost to replace a timing belt on a 2004 Lexus GX470?

The average cost to replace the timing belt on a 2004 Lexus GX470 is approximately $1,411, but can range from around $409 to over $2,400 depending on labor rates and whether other components like the water pump are replaced. The high cost is due to the extensive labor involved, as many parts must be disassembled to access the belt. For a complete job including the water pump, parts and labor can push the price to nearly $2,000. 
Cost breakdown and factors

• Parts cost: The timing belt itself is inexpensive, but other parts like the water pump, tensioners, and idlers are often replaced at the same time to avoid repeating the labor-intensive process later. 
• Labor cost: Labor is the biggest factor. The job requires several hours of work, and hourly rates vary between shops. 
• Price variations:
  • Some sources estimate a range as low as $409 to $919. 
  • Other estimates for the 2004 model are around $1,411. 
  • A full timing belt, water pump, and seal replacement job can cost up to $1,964.93 at a Toyota dealership. 
  • Some quotes for a timing belt and water pump job are around $1,210 at a Lexus dealer. 

What to do to get a better price

• Get multiple quotes: Shopping around at different shops, including independent mechanics and dealerships, is the best way to find a competitive price. 
• Ask about packages: Inquire about a comprehensive kit that includes the timing belt, water pump, and other seals to save on labor if they fail in the future. 
• Negotiate: Be prepared to negotiate, especially if you find lower quotes elsewhere. 

Does a 2004 Lexus GX470 have a timing belt or chain?

The 2004 Lexus GX470 has a timing belt. It should be replaced around every 90,000 miles or 8 years, and a replacement kit often includes a new water pump, tensioner, and idlers. This is because the GX470 has an interference engine, meaning a broken belt will likely cause catastrophic engine damage.
 
Timing belt replacement

• Replacement interval: The timing belt should be replaced every 90,000 miles or 8 years, whichever comes first. 
• Why it's important: The engine is an "interference" engine, so if the timing belt breaks, the engine can be severely damaged. 
• Associated parts: It is recommended to replace the water pump, tensioner, and idlers at the same time, as many of the same components must be removed to access the timing belt. 

This video demonstrates the process of replacing the timing belt and water pump on a Lexus GX470: 1mHow to AutomotiveYouTube · Oct 8, 2018
Signs of a worn timing belt
Engine misfires, Ticking noise from the engine, and Difficulty starting the engine.