What is the final drive ratio of the LS430?
The final drive ratio for the Lexus LS430 is 3.27:1 in the standard rear-wheel-drive configuration. AWD models use the same rear-axle ratio, with the all-wheel system adding a center differential to manage front-to-rear torque. Exact figures can vary by market or production year, so it's best to confirm with your vehicle’s documentation or VIN-specific specs.
Understanding the final drive ratio and its role
The final drive ratio, sometimes called the differential ratio, is the fixed gear reduction between the driveshaft and the wheels. For the LS430's V8 engine and four-speed automatic transmission, a 3.27:1 ratio means the driveshaft completes 3.27 revolutions for every one turn of the drive wheels, boosting low-end torque and affecting engine RPM at highway speeds.
LS430 variants and how the ratio can differ
Rear-wheel drive (RWD)
In the standard Lexus LS430 sold in most markets as a rear-wheel-drive sedan, the rear differential is typically listed with a final-drive ratio of 3.27:1. This configuration emphasizes a balance of smooth highway cruising and comfortable acceleration characteristics for a full‑size luxury sedan.
All-wheel drive (AWD)
All-wheel-drive LS430 variants use the same rear-axle final-drive ratio in the differential, with the center differential adjusting torque distribution to the front wheels. The published specifications commonly cite the 3.27:1 rear-axle ratio, while the overall drive effectiveness also depends on the AWD hardware, such as the transfer mechanism.
How to verify the exact ratio on your vehicle
To confirm the precise final-drive ratio for a specific LS430, check the vehicle’s documentation, the axle differential tag, or a VIN-based parts catalog. Some owners find the ratio stamped on the differential housing or listed in the service manual. If you’re unsure, a Lexus dealer or qualified technician can pull the exact specification from the vehicle’s VIN.
Impact on performance and fuel economy
A final-drive ratio of 3.27:1 provides a compromise between response and efficiency. It helps deliver confident acceleration from a standstill and comfortable, lower-rev cruising on highways, but it also means somewhat higher engine RPM at typical highway speeds compared to cars with taller gearing. The effect can be more noticeable if you track fuel economy or engage in heavy driving with a full load of passengers and luggage.
Summary
For the Lexus LS430, the commonly cited final-drive ratio is 3.27:1 on the rear axle for the RWD version, with AWD models using the same rear ratio while relying on the center differential for front torque distribution. Always verify via VIN-specific sources to confirm your exact configuration.
What is the drag coefficient of the LS 430?
The Lexus LS430 has a drag coefficient of 0.25 with the optional air suspension and 0.26 with the standard coil suspension. This low figure was class-leading at the time and contributes to its aerodynamic efficiency.
You can watch this video to learn more about the Lexus LS430's drag coefficient and how it compares to other cars: 1mDavid BelloYouTube · Apr 27, 2018
- With air suspension: Cd=0.25cap C sub d equals 0.25𝐶𝑑=0.25
- With standard coil suspension: Cd=0.26cap C sub d equals 0.26𝐶𝑑=0.26
- The air suspension system lowers the vehicle at higher speeds, improving aerodynamics and reducing the drag coefficient from 0.260.260.26 to 0.250.250.25.
What is the differential ratio of the gs430?
Rear Axle Differential Carrier 3.266 Ratio.
What is a final drive ratio?
The final drive ratio is typically the gear ratio for the differential, or the final location where the gearing is altered before being sent to the wheels. Changing the final drive ratio heavily impacts the way the car behaves.
How much horsepower does a LS 430 have?
The Lexus LS 430 has a 4.3-liter V8 engine that produces 290 horsepower and 320 lb-ft of torque. However, some sources specify slightly lower horsepower for certain model years, such as 278 hp for 2006 and 2007 models.
Horsepower by year
- 290 hp: 2001-2005 models
- 278 hp: 2006-2007 models
Engine
- Engine size: 4.3 liters
- Engine type: V8
- Transmission: 5-speed or 6-speed automatic, depending on the model year
