Frequently Asked Questions About Kenworth W990 Front Axle Air Ride Kits

Will these air ride kits fit my specific year model W990, and what about W900L compatibility?

Most front axle air ride kits are designed to fit Kenworth W990 models from 2018 to present. However, fitment can vary based on your specific axle configuration and GVWR rating. While the W990 and W900L share some similarities, the frame rail spacing and mounting points differ. We recommend checking your truck's VIN and axle model number before ordering. If you have a W900L, you'll need to look at our W900 specific kits instead.

What's the typical installation time and do I need special tools or professional help?

Installation typically takes 6-8 hours for an experienced technician. You'll need standard shop tools plus a few specialized items: spring compressors, air line cutting tools, and torque wrenches capable of 450-500 ft-lbs for the U-bolts. Most customers choose professional installation due to the safety-critical nature of suspension work. If you're DIY-inclined, ensure you have a proper lift, jack stands rated for commercial trucks, and follow the torque specifications exactly. Many shops charge between $800-1,200 for installation.

How much will air ride improve my ride quality compared to standard leaf springs?

Drivers typically report a 60-70% improvement in ride quality, especially on rough roads and expansion joints. The air ride system absorbs road shock better than leaf springs, reducing cab bounce and driver fatigue. You'll notice the biggest difference when running empty or lightly loaded. The system maintains consistent ride height regardless of load, eliminating the harsh ride common with leaf springs when bobtailing. Most drivers say the improvement in comfort alone justifies the investment within the first year.

What maintenance is required and what's the typical lifespan of these air ride systems?

Air ride systems require minimal maintenance but regular attention. Check air bag pressure weekly, inspect for air leaks monthly, and drain moisture from the air system daily in cold weather. The air bags typically last 300,000-500,000 miles with proper care. Common wear items include the height control valve (around 250,000 miles) and shock absorbers (150,000-200,000 miles). Keep the air bags clean and free from oil contamination, as petroleum products can degrade the rubber. Most systems come with a 2-3 year warranty.

What's included in the complete kit and will I need additional parts?

A complete front axle air ride kit typically includes: air springs, mounting brackets, height control valve, shock absorbers, air lines and fittings, and detailed installation instructions. However, you may need to purchase separately: air tank (if your truck doesn't have auxiliary air capacity), pressure protection valve, air gauge for the dash, and new U-bolts if yours are worn. Some kits are "universal" and may require minor fabrication or additional brackets for perfect fitment. Always verify what's included before ordering to avoid installation delays.