Frequently Asked Questions About Peterbilt 389 Glider Air Tanks, Wraps & Mounting

Will these air tanks fit my specific year Peterbilt 389 glider kit?

Our air tanks are designed to fit all Peterbilt 389 glider models from 2008 to present. The mounting brackets and tank dimensions are compatible with the standard frame rail spacing found on 389 gliders. However, if your truck has custom frame modifications or non-standard wheelbase configurations, we recommend measuring your existing setup or contacting us with your VIN for verification.

What's the difference between aluminum and steel air tanks, and which should I choose?

Aluminum tanks are lighter (typically 40-50% less weight than steel), won't rust, and provide better fuel economy due to weight savings. Steel tanks are more affordable upfront and highly durable against impacts. For most glider kit applications, we recommend aluminum tanks since weight reduction is crucial for maximizing payload capacity. Steel remains a solid choice for severe-duty applications or budget-conscious builds.

Do I need special tools or professional installation for the tank mounting brackets?

Basic installation requires standard shop tools including a drill with metal bits, socket set, and torque wrench. The mounting brackets bolt directly to existing frame holes on most 389 gliders, taking 2-3 hours for a complete install. Some applications may require minor drilling for auxiliary brackets. We include detailed instructions with torque specifications. Many customers complete the installation themselves, though professional installation ensures proper alignment and pressure testing.

What size air tanks do I need, and can I mix different capacities?

Standard Peterbilt 389 gliders typically use dual tanks ranging from 11 to 25 gallons each. The most common configuration is matching tanks (same size on both sides) for balanced weight distribution. Your required capacity depends on your air system demands - standard brake systems work well with 11-gallon tanks, while trucks with air suspension, air horns, and auxiliary equipment benefit from 20-25 gallon tanks. Mixing sizes is possible but not recommended as it can affect brake balance.

Are the tank wraps/covers necessary, and will they fit aftermarket tanks?

While not required for function, tank wraps protect against road debris, corrosion from salt and chemicals, and UV damage that can fade aluminum. They also provide a finished appearance that matches your truck's aesthetic. Our wraps are designed for standard diameter tanks (typically 12.25" or 16.25") commonly used on 389 gliders. They feature adjustable straps to accommodate both OEM and most aftermarket tanks. Measure your tank diameter before ordering to ensure proper fit.