Frequently Asked Questions About Peterbilt 330/335/337 Air Tanks, Wraps & Mounting
What size air tanks fit the Peterbilt 330, 335, and 337 models, and are they interchangeable between model years?
The Peterbilt 330, 335, and 337 typically use 8-inch diameter aluminum air tanks with lengths ranging from 20 to 26 inches. These models from 2005-2015 generally share the same frame rail spacing and mounting configurations, making tanks interchangeable within this range. However, 2016 and newer models may have different emission equipment placement that affects tank positioning. Always verify your specific truck's frame measurements and existing tank dimensions before ordering.
Do I need special tools or professional installation for air tank replacement and mounting brackets?
Basic air tank replacement requires standard mechanic tools including wrenches, air line disconnect tools, and a torque wrench for proper bracket installation. The job typically takes 2-3 hours for experienced DIY mechanics. Critical steps include safely depressurizing the system, supporting the tank weight during removal, and torquing mounting brackets to 45-50 ft-lbs. While manageable for those with mechanical experience, professional installation is recommended if you're unfamiliar with air brake systems due to safety considerations.
What's the difference between polished aluminum and powder-coated air tanks, and which holds up better?
Polished aluminum tanks require regular maintenance with aluminum polish to maintain their mirror finish but offer excellent corrosion resistance naturally. Powder-coated tanks provide a durable, low-maintenance finish that resists chips and scratches better than polish but may show wear at mounting points over time. For trucks in harsh winter conditions with road salt exposure, powder-coated tanks typically last longer without showing corrosion. Polished tanks are preferred for show trucks or when matching existing polished components.
Will aftermarket air tank wraps and heat shields fit OEM Peterbilt tanks?
Most universal air tank wraps are designed to fit standard 8-inch diameter tanks, making them compatible with OEM Peterbilt tanks. Measure your tank circumference to ensure proper fit - wraps should have approximately 8-9 inches of coverage for complete protection. Stainless steel heat shields specifically designed for Peterbilt 330/335/337 models will direct-fit OEM tanks and typically include mounting hardware. Generic wraps may require trimming for proper clearance around brackets and air lines.
How do I determine if I need new mounting brackets or straps when replacing air tanks?
Inspect existing brackets for cracks at weld points, elongated mounting holes, or rust penetration beyond surface level. Straps should be replaced if they show fraying, corrosion at adjustment points, or won't maintain proper tension. When upgrading from steel to aluminum tanks, existing brackets typically work fine, but verify the tank diameter matches. New brackets are recommended if switching tank sizes or if your current brackets show any structural damage, as failed brackets can cause catastrophic tank damage while driving.
