378
Peterbilt 378 Overview
The Peterbilt 378 is a Class 8 vocational and highway-capable conventional truck, produced from the late 1980s through the mid-2000s. It was known for combining the durability needed for heavy-duty work with the comfort and options required for long-haul trucking. The 378 became a popular choice for fleets and owner-operators who needed versatility in both on-road and vocational settings.
The Peterbilt 378 was widely used for:
- Dump trucks
- Heavy haul and lowboy applications
- Long-haul trucking
- Flatbed freight
- Mixer trucks
- Tanker and fuel delivery
- Oilfield support
Its set-forward axle option made it especially well-suited for bridge-formula compliance in many U.S. states.
Cab Type
- Cab Style: Conventional narrow-body
- Cab Width: Approximately 1.9 meters (75 inches)
- Available in day cab, flat top sleeper, and raised roof sleeper configurations
- Shares the same cab shell as the 375, 377, 379, and 385 (narrow cab models)
Aftermarket Seat Compatibility
The Peterbilt 378 uses the standard vocational/narrow-body seat bolt pattern: 4.68" x 12"
Most aftermarket seats will bolt in directly with no adaptor required.
Installation Notes
- No adaptor needed for most seat replacements
- On sleeper cabs, ensure there's enough vertical clearance if using high-travel suspension seats
- Some 378s may have aftermarket risers or shims—remove these if upgrading to a taller seat
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National Admiral (choose your options)
National Seating
Your Price: 1,972.40CAD - 3,256.46CADThe Admiral is the top of the line seat from National for comfort behind the wheel. As a step up from the Commodore, the Admiral includes both swivel and heat as well as adjustable damper. This seat packs a lot of value for the price...40049/40079Your Price: 1,972.40CAD - 3,256.46CAD -
National Captain Seat (choose your options)
National Seating
Your Price: 1,026.97CAD - 1,302.03CADNational Captain Seat (50766 low, 50765 mid, 50764 high) is the low cost fleet seat of choice. The Captain series is built using National Seating's top selling truck seat platform which is known for its ergonomic comfort and low cost of ownership...5076(4,5,6).xxxYour Price: 1,026.97CAD - 1,302.03CAD -
National Commodore Seat (choose your options)
National Seating
Your Price: 1,676.61CAD - 2,076.06CADNational Commodore Seat (40050) is the long haul seat of choice. The Commodore truck seat helps ensure you get maximum uptime by helping to reduce the pain and strain which leads to increased downtime. The Commodore is the first in the National...40050Your Price: 1,676.61CAD - 2,076.06CAD