Frequently Asked Questions About Peterbilt 357/378 Air Tanks, Wraps & Mounting

What years do these air tanks fit, and are there differences between 357 and 378 models?

These air tanks are designed to fit Peterbilt 357 and 378 models from 1987 through 2007. While the 357 and 378 share the same frame rails and mounting points, always verify your specific truck's configuration before ordering. Extended hood models and custom chassis may require different mounting brackets. We recommend checking your VIN with our parts specialists if you have a modified truck or are unsure about compatibility.

Are the aluminum air tanks worth the extra cost over steel, and how long do they typically last?

Aluminum air tanks offer significant advantages including 40-50% weight reduction and superior corrosion resistance compared to steel tanks. In real-world conditions, quality aluminum tanks typically last 15-20 years with proper maintenance, while steel tanks may need replacement every 7-10 years due to rust. The weight savings alone can add up to better fuel economy over time. However, steel tanks remain a solid budget option for trucks that see less road salt exposure.

How difficult is the installation, and what tools or additional parts will I need?

Installation typically takes 2-4 hours for someone with basic mechanical skills. You'll need standard hand tools, including socket sets, wrenches, and potentially an air impact wrench for stubborn bolts. Most tank kits include mounting brackets, but you may need to purchase new air line fittings, mounting bolts, and thread sealant separately. Some installations require relocating existing components or modifying brackets for proper clearance. Professional installation usually runs $200-400 if you prefer not to tackle it yourself.

What's the difference between polished, brushed, and powder-coated finishes for longevity?

Polished stainless steel wraps offer the best long-term appearance but require regular maintenance to prevent water spots and maintain shine. Brushed aluminum provides a more forgiving finish that hides minor scratches and requires less upkeep. Powder-coated tanks excel in corrosion resistance and are ideal for work trucks, though the coating can chip if impacted by road debris. For show trucks, polished is preferred; for working trucks, powder-coated or brushed finishes prove more practical.

Do aftermarket air tanks affect my truck's air system performance or DOT compliance?

Quality aftermarket air tanks that match or exceed OEM specifications will not negatively impact your air system performance. All tanks we carry meet DOT requirements and are stamped with proper certifications. Ensure you maintain the same or greater air capacity as your original setup. When replacing tanks, it's crucial to test the system for leaks and verify proper air pressure build-up times to remain compliant with DOT regulations and maintain safe braking performance.