Medium Duty 335

The Peterbilt 335 is a Class 6 or Class 7 medium-duty truck, known for its durability, flexibility, and clean styling. It was a predecessor to the 330 and 337 in Peterbilt’s medium-duty lineup, offering a reliable chassis for a wide range of vocational and delivery-based work.

The 335 has long been a fleet favorite for:

• Regional and local delivery (box/reefer)
• Rollback and towing
• Utility service trucks
• Dump and landscape trucks
• Tanker and vacuum trucks
• Municipal and fire/rescue applications

Its combination of size, GVWR options (up to ~33,000 lbs), and Peterbilt’s build quality made it a versatile choice for operators who needed dependable performance in both city and highway environments.

Cab Type:

The Peterbilt 335 uses the 1.9-meter (76") narrow vocational cab, shared with the 325, 330, and 337 models. While compact, it’s built with the same aluminum cab structure Peterbilt is known for, and it can be spec’d with basic or premium trim packages.

Aftermarket Seat Compatibility:

Since the 335 uses the 1.9-meter narrow cab, it has a standard vocational seat bolt pattern, typically around 4.68" x 12". This makes it compatible with a wide range of aftermarket seat models, particularly those designed for vocational or medium-duty use.

Popular aftermarket seat options for the 335:

• Knoedler Harrier – a low-profile air ride seat ideal for limited headroom
• National Corsair or Ensign – mechanical and air ride options with narrow base fitment
• Bostrom Wide Ride Core or T-Series – may need a low-profile base or adaptor depending on cab layout

Installation Notes:

• Most aftermarket seats will fit directly.
• Ensure seat width and suspension height work with the cab’s floor-to-ceiling space.
• Some 335 models have HVAC or battery boxes under the seat—check for interference before installation.
• Low-profile seats are often preferred for headroom and entry ease.