Frequently Asked Questions About Mack RD Truck Front Axle Air Ride Kits

Will these air ride kits fit my specific Mack RD model year?

Our front axle air ride kits are designed to fit Mack RD series trucks from 1988 to 2007, including RD688, RD690, RD600, and RD800 models. However, compatibility can vary based on your truck's specific front axle configuration (12,000 lb, 14,000 lb, or 16,000 lb capacity) and whether you have a set-back or set-forward axle. We recommend checking your truck's VIN plate or contacting us with your truck's serial number to ensure proper fitment before ordering.

How difficult is the installation, and can I do it myself?

Installation typically takes 6-8 hours for experienced mechanics and requires standard shop tools plus an air compressor for system testing. The kit includes detailed instructions, but you'll need to drill mounting holes in the frame rails and run air lines to your existing air system. Many customers successfully install these themselves, though proper alignment and torque specifications are critical for safety. If you're not comfortable with heavy suspension work, we recommend professional installation, which usually costs between $800-1,200 at most truck shops.

What's the actual ride improvement I can expect?

Customers typically report a 60-70% reduction in cab bounce and vibration, especially noticeable on rough roads and construction sites. The air ride system absorbs impacts that would normally transfer directly through leaf springs to the cab. You'll experience less driver fatigue on long hauls, reduced wear on cab components, and better control over washboard roads. The improvement is most dramatic for trucks that frequently run with varying loads or operate on unpaved surfaces.

What maintenance do these air ride systems require?

Air ride systems require minimal but important maintenance. Check air bags for leaks or damage during pre-trip inspections, maintain proper air pressure (typically 60-80 PSI depending on load), and inspect mounting hardware torque every 10,000 miles. Air bags typically last 100,000-150,000 miles with proper use. Keep the system clean and free of road debris, especially in winter conditions where salt and chemicals can cause corrosion. Most maintenance can be performed during regular service intervals.

Can I adjust the ride height, and how does this affect my truck?

Yes, most kits include a ride height control valve that allows 2-3 inches of adjustment. This lets you maintain consistent ride height regardless of load weight and compensate for air bag wear over time. Proper ride height is crucial for maintaining correct driveline angles and preventing premature u-joint wear. The system automatically maintains your set height, but you can manually adjust for specific situations like low clearance areas. Remember that extreme height changes can affect headlight aim and may require readjustment.