Frequently Asked Questions About Peterbilt 357/378 Fuel Tank Steps

What material are these fuel tank steps made from, and will they rust or corrode?

Most Peterbilt 357/378 fuel tank steps are manufactured from either polished stainless steel or heavy-duty aluminum. Stainless steel options offer superior corrosion resistance and maintain their shine with minimal maintenance, while aluminum steps are lighter weight and naturally resist rust. Both materials are designed to withstand road salt, weather exposure, and diesel fuel contact. For maximum longevity, we recommend stainless steel steps for trucks operating in harsh winter conditions or coastal areas.

Will these steps fit my specific Peterbilt 357 or 378 model year?

Fuel tank steps for Peterbilt 357 and 378 models are generally compatible across years 1987-2007, as these trucks share similar frame rail spacing and fuel tank configurations. However, custom tank setups or aftermarket modifications may affect fitment. The critical measurement is the distance between your frame rail and fuel tank - standard steps accommodate 18-24 inch spacing. Always verify your truck's specific measurements before ordering, especially if you have dual fuel tanks or have modified your fuel system.

How difficult is the installation process, and what tools do I need?

Installation typically takes 1-2 hours per side and requires basic hand tools including a drill with metal bits, wrenches, and a torque wrench. Most fuel tank steps mount using existing frame rail holes or require drilling 2-4 new mounting holes. The main challenges customers report are accessing tight spaces between the tank and frame, and ensuring proper alignment before final tightening. We strongly recommend having a second person assist with positioning while you secure the brackets. Professional installation usually runs $100-200 if you prefer not to do it yourself.

What styles and finishes are available, and which holds up best?

Common options include polished stainless steel, brushed stainless, powder-coated steel, and polished aluminum. Polished stainless steel remains the most popular choice due to its mirror-like finish and durability, though it requires periodic polishing to maintain its appearance. Powder-coated options offer excellent rust protection and come in black or custom colors, but may chip if struck by road debris. Diamond plate patterns provide additional traction in wet conditions. For work trucks, we recommend brushed stainless or powder-coated finishes as they hide scratches better than polished surfaces.

What width and tread pattern should I choose for safety and comfort?

Standard fuel tank steps range from 4 to 6 inches in width, with 5-inch steps being the most common choice for a balance of stability and clearance. Wider steps provide more foot support but may reduce ground clearance or interfere with tight maneuvering. Tread patterns include smooth, diamond plate, and grip-strut designs. For maximum safety, especially in regions with ice or frequent rain, choose grip-strut or aggressive diamond plate patterns. Smooth steps look cleaner but can become slippery when wet or covered in diesel fuel.