377
The Peterbilt 377 is a Class 8 aerodynamic conventional truck, introduced in the late 1980s and produced into the early 2000s. It was designed for long-haul and regional freight, offering improved fuel economy over classic square-nose models like the 379. The 377 was a popular fleet and owner-operator truck due to its balance of aerodynamics, durability, and comfort.
The 377 was commonly used for:
- Long-haul trucking
- Reefer and dry van freight
- Regional distribution
- Fuel-efficient fleet operations
- Flatbed and tanker hauling
Its aerodynamic shape and sleeper options made it a go-to for fleets looking to reduce drag without giving up classic Peterbilt reliability.
Cab Type
- Cab Style: Aerodynamic conventional
- Cab Width: Approximately 1.9 meters (narrow cab)
- Available as day cab, flat top sleeper, and raised roof sleeper
- Shared cab structure with the 375, 376, and early 385
Aftermarket Seat Compatibility
The Peterbilt 377 uses the standard vocational/narrow-body bolt pattern: 4.68" x 12"
This means most aftermarket seats will bolt in directly with no adaptor required.
Installation Notes
- No adaptor plate needed for standard seat installs
- Headroom varies by sleeper size—raised roof = more flexibility, flat top = lower seat recommended
- Some older 377s may have custom risers or base brackets—verify and remove if needed
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GraMag Mid Back Black Genuine Leather with Heat and Vent Option Truck Seat
GRAMAG
Your Price: $1,805.00 - $2,225.00GraMag mid back semi truck seat in black Genuine Leather with black or grey stitching with air suspension for aftermarket seating for International, Freightliner, Kenworth, Volvo, Peterbilt semi trucks. On-Highway seat ideal for...AF-21103LEYour Price: $1,805.00 - $2,225.00 -
On Sale
GraMag Mid Back SteadyRide MR (smart fluid) Black Leather Truck Seat
GRAMAG
Now: $3,938.00Was: $4,325.00GraMag Mid Back SteadyRide semi truck seat in black leather with black stitching will easily install in most all semi-truck cabs. The on-highway seat is ideal for long haul environments as it reduces whole-body-vibration up to 67%. ...AF-22013LENow: $3,938.00Was: $4,325.00 -
On Sale
GraMag Mid Back SteadyRide MR (smart fluid) with Heat and Vent Truck Seat
GRAMAG
Your Price: $4,085.00 - $4,185.00GraMag Mid Back SteadyRide semi truck seat in black leather black stitching will easily install in most all semi-truck cabs. This seat includes Heating and Venting. The on-highway seat is ideal for long haul environments as it reduces...AF-22113LEYour Price: $4,085.00 - $4,185.00 -
On Sale
GraMag SteadyRide MR (smart fluid) Black Cloth Truck Seat
GRAMAG
Now: $3,688.00Was: $4,055.00GraMag SteadyRide semi truck seat in black Cloth with your choice of (black, grey, tan) stitching will easily install in most all semi-truck cabs. The on-highway seat is ideal for long haul environments as it reduces whole-body-vibration...AF-12013CLNow: $3,688.00Was: $4,055.00 -
On Sale
GraMag SteadyRide MR (smart fluid) Black Leather Truck Seat
GRAMAG
Now: $3,938.00Was: $4,325.00GraMag SteadyRide semi truck seat in black leather with your choice of (black, grey, tan) stitching will easily install in most all semi-truck cabs. The on-highway seat is ideal for long haul environments as it reduces whole-body-vibration...AF-12013LENow: $3,938.00Was: $4,325.00 -
On Sale
GraMag SteadyRide MR (smart fluid) Black Leather with Heat and Vent Truck Seat
GRAMAG
Now: $4,085.00Was: $4,489.00GraMag SteadyRide semi truck seat in black leather with your choice of (black, grey, tan) stitching will easily install in most all semi-truck cabs. This seat includes Heating and Venting. The on-highway seat is ideal for long haul...AF-12113LENow: $4,085.00Was: $4,489.00 -
Knoedler Air Chief Overstuffed Channeled Seat (choose your options)
Knoedler Manufacturers
Your Price: $1,658.00 - $1,830.00The 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: Overstuffed Channeled upholstery construction in...Air Chief with 730252-000Your Price: $1,658.00 - $1,830.00 -
Knoedler Air Chief Seat (choose your options)
Knoedler Manufacturers
Your Price: $1,259.00 - $1,939.00The 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 ChiefYour Price: $1,259.00 - $1,939.00 -
Knoedler Air Chief Tall Back Seat (choose your options)
Knoedler Manufacturers
Your Price: $1,301.00 - $1,939.00Introducing the new Tall Back seat from Knoedler Manufacturers. The Tall Back seat is part of the Air Chief line. The main difference is a switch from the mid back with headrest design to the full/tall back style. All options available...Air Chief Tall BackYour Price: $1,301.00 - $1,939.00 -
Knoedler Harrier (choose your options)
Knoedler Manufacturers
Your Price: $1,086.00The Knoedler Harrier is an x-type air suspension seat with optional isolator lock out. The Harrier has been recently expanded to include a mid back, high back (Standard) and Tall Back Option, with optional arms, bellow cover and wide seat. ...9410Your Price: $1,086.00 -
National Admiral (choose your options)
National Seating
Your Price: $1,427.00 - $2,356.00The 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: $1,427.00 - $2,356.00 -
National Admiral CT (choose your options)
National Seating
Your Price: $1,972.13 - $2,200.98The Admiral CT is the top of the line seat from National for comfort behind the wheel and includes Comfort Tek air circulation through out the seat. As a step up from the Admiral, the Admiral CT includes swivel and heat as well as cooling. Combine...40149/40179Your Price: $1,972.13 - $2,200.98