Peterbilt 337
Medium-duty truck • Production 2012–present
About the Peterbilt 337
The Peterbilt Model 337 is Peterbilt's Class 7 medium-duty conventional cab truck. Used for box trucks, delivery, dump applications, utility/bucket trucks, and service bodies. Built on the same cab platform as the Class 6 Model 337 (some confusion in numbering exists; Peterbilt also has a Model 348 in some configurations). The 337 competes with Freightliner M2 106/112 and Kenworth T370 in Class 6-7 medium-duty markets. PACCAR PX-7 (6.7L) is standard; PACCAR PX-9 (8.9L) for heavier applications. Cummins L9 is also available.
Overview
The Peterbilt Model 337 is Peterbilt's Class 7 medium-duty conventional cab truck. Used for box trucks, delivery, dump applications, utility/bucket trucks, and service bodies. Built on the same cab platform as the Class 6 Model 337 (some confusion in numbering exists; Peterbilt also has a Model 348 in some configurations). The 337 competes with Freightliner M2 106/112 and Kenworth T370 in Class 6-7 medium-duty markets. PACCAR PX-7 (6.7L) is standard; PACCAR PX-9 (8.9L) for heavier applications. Cummins L9 is also available.
Specifications
- Manufacturer
- Peterbilt
- Class
- Class 7
- Vehicle type
- Medium-duty truck
- Cab type
- Day cab, crew cab, supercab
- Production years
- 2012–present
- Applications
- Box truck, delivery, dump, utility, severe duty service body
- Typical engines
- PACCAR PX-7, PACCAR PX-9, Cummins L9
- Typical transmissions
- Allison automatic
- GVWR range
- 26,000-33,000 lb
Design and engineering
Conventional medium-duty cab with set-back front axle for tight turning. Aluminum cab for corrosion resistance. Crew cab variants accommodate vocational work crews. Optional 4x4 drive on some chassis configurations.
Generations and major changes
Market position and popularity
337 has steady but modest sales — Peterbilt is less dominant in medium-duty than in Class 8. Common in utility fleets, premium vocational service body applications, and dump/concrete in lighter configurations. Resale is reasonable for Peterbilt brand strength.
Who buys this truck
Premium utility fleets, severe-duty service body operations, dump/concrete contractors wanting Peterbilt brand, owner-operators in vocational Class 7.
Common problems and reliability notes
PACCAR PX-7 EGR cooler issues at 200K+ miles (smaller engine, same general issues as MX-13). DEF system in stop-and-go medium-duty use. Cab squeaks/rattles on heavy-vibration vocational use.
Pros and cons
✓ Pros
- • Peterbilt brand and fit-and-finish in medium-duty
- • PACCAR or Cummins L9 engine options
- • Aluminum cab corrosion resistance
- • Strong resale for medium-duty
⚠ Cons
- • Higher cost than Freightliner M2 for similar specs
- • Smaller dealer network in medium-duty market
- • Less variety of body-builder partnerships than Freightliner
Recalls and complaints by model year
Browse recalls and complaints by model year:
| Year | Recalls | Complaints | Links |
|---|---|---|---|
| 2016 | 0 | 2 | Complaints |
| 2014 | 2 | 1 | Recalls Complaints |