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357

357

The Peterbilt 357 is a rugged, Class 8 vocational truck that was produced until around 2007. Known for its durability and customizable chassis, the 357 was a staple in construction, aggregate, and heavy-haul industries. It shares much of its design lineage with the Peterbilt 378 but was typically spec’d for more vocational uses.

The 357 was widely used in:

  • Dump trucks
  • Cement mixers
  • Lowboy and equipment haulers
  • Heavy-duty plow trucks
  • Oilfield and logging operations

Its strength and spec flexibility made it a workhorse in off-road and vocational sectors.

Cab Type

  • Cab Style: Vocational conventional cab
  • Cab Width: Approximately 1.9 meters (75")
  • Shares a narrow vocational cab shell with other Peterbilt models like the 340, 335, and earlier 348s

Aftermarket Seat Compatibility

The Peterbilt 357 uses the standard vocational bolt pattern of approximately 4.68" x 12", which is widely supported across most aftermarket seat manufacturers.

Common aftermarket options:

  • National Admiral, or Commodore – fits with standard pattern
  • Bostrom T-Series or Pro Ride – air ride or mechanical versions
  • Knoedler Air Chief or Harrier – fits standard vocational pattern
  • Gramag seats – generally require no adaptor in this cab

Installation Notes

  • No adaptor plate is needed in most cases—standard vocational pattern applies.
  • If your 357 has been modified or has a raised floor, check seat height and suspension clearance.
  • For premium upgrades (heated/cooled seats or massage), verify your truck’s 12V power availability under the seat.
  • Bostrom Wide Ride Core High Back, no arms, Black and Grey

    Bostrom Wide Ride Core (choose your options)

    Bostrom Seating

    Your Price: 0.00CAD - 2,630.79CAD
    Bostrom Wide Ride Core - New Technology, New Style, Smarter than Ever from Bostrom Seating If you are in and out of the cab frequency - The new Wide Ride CORE with Dump and Memory switch may be the right seat for you.  The Wide Ride CORE provides...
    5Ax9xxx
    Your Price: 0.00CAD - 2,630.79CAD
  • Knoedler Air Chief

    Knoedler Air Chief Seat (choose your options)

    Knoedler Manufacturers

    Your Price: 1,735.03CAD - 2,672.14CAD
    The Knoedler Air Chief line offers a customizable seat to meet the individual needs of drivers rather than a one seat fits all solution.  All seats come standard with the following features: Upper and Lower Air Adjustable lumbar Color Definition ...
    Air Chief
    Your Price: 1,735.03CAD - 2,672.14CAD
  • National Seating Admiral in Baltic Blue and Silver Grey Genuine Leather

    National Admiral (choose your options)

    National Seating

    Your Price: 1,966.55CAD - 3,246.80CAD
    The 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...
    40049/40079
    Your Price: 1,966.55CAD - 3,246.80CAD