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Peterbilt 357/378 Parts

Find the best Peterbilt 378 aftermarket parts in the business here at 4 State. The Peterbilt 378 semi truck represents all of the characteristics of the Peterbilt brand, and was a popular model with similar features to the Peterbilt 379. Pete truck models are a brand of choice for experienced truckers who need dependable semi trucks. 4 State Trucks has all the semi truck parts and accessories you need to make your Pete 378 stand out to showcase your unique personality. Whether you need aftermarket bumpers, exhaust, or fuel tanks, we've got you covered. Hit the open road in style and comfort with the best custom gear for your Peterbilt heavy duty truck or 18 wheeler.
  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Roadworks 94 X 4 Inch Stainless Steel Full Bumper Bar W/ Oval Light Hole Options

    Roadworks 94 X 4 Inch Stainless Steel Full Bumper Bar W/ Oval Light Hole Options

    ROADWORKS

    $161.99 - $178.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRoadworks 94 X 4 Inch Stainless Steel Full Bumper Bar W/ 5 Oval Light Holes94 X 4 Inch Stainless Steel...
    PPR_301355
    SKU:
    PPR_301355
    Length Options:
    94 Inch
    Product Type:
    Bumpers
    Width Options:
    94 Inch
    Light Options:
    Without Lights
    Height Options:
    4 Inch
    Material Options:
    Stainless Steel
    Location:
    Made In USA
    Make:
    Universal Items
    $161.99 - $178.99
    Qty in Cart: 0
    Price:
    $161.99 - $178.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    Roadworks 304 Stainless Steel 15 Inch Vortox Breather Screen W/ Cutout Options For Peterbilt

    Roadworks 304 Stainless Steel 15 Inch Vortox Breather Screen W/ Cutout Options For Peterbilt

    ROADWORKS

    $124.89 - $383.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 337 2011 thru 2023* Fits Peterbilt 352 1972 thru 1980* Fits Peterbilt...
    PPR_301364
    SKU:
    PPR_301364
    Material Options:
    Stainless Steel
    Product Type:
    Exterior
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Diameter Options:
    15 Inch
    Style Options:
    Donaldson Style
    Make:
    Peterbilt
    Make:
    Kenworth
    Ready To Ship:
    Yes
    $124.89 - $383.99
    Qty in Cart: 0
    Price:
    $124.89 - $383.99
    Subtotal:
  • Roadworks Stainless Steel Channel W/ Length & Rectangular Light Hole Options

    Roadworks Stainless Steel Channel W/ Length & Rectangular Light Hole Options

    ROADWORKS

    $22.73 - $41.48
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRoadworks 8 Inch Stainless Steel Channel W/ 1 Rectangular Light Hole8 Inch Stainless Steel Channel W/ 1...
    PPR_301351
    SKU:
    PPR_301351
    Light Options:
    Without Lights
    Height Options:
    6 Inch
    Location:
    Made In USA
    Length Options:
    8 Inch
    Product Type:
    Lighting
    Length Options:
    16 Inch
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    $22.73 - $41.48
    Qty in Cart: 0
    Price:
    $22.73 - $41.48
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  • Roadworks 304 Stainless Steel Punched Breather Screen Chopped W/ Cutout Options For Peterbilt W/ 15 Inch Standard Donaldson

    Roadworks 304 Stainless Steel Punched Breather Screen Chopped W/ Cutout Options For Peterbilt W/ 15 Inch Standard Donaldson

    ROADWORKS

    $397.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 337 2011 thru 2023* Fits Peterbilt 352 1972 thru 1980* Fits Peterbilt...
    PPR_301360
    SKU:
    PPR_301360
    Product Type:
    Exterior
    Diameter Options:
    15 Inch
    Style Options:
    Donaldson Style
    Material Options:
    Stainless Steel
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    $397.99
    Qty in Cart: 0
    Price:
    $397.99
    Subtotal:
  • Roadworks Stainless Steel Channel W/ Light Hole & Length Options

    Roadworks Stainless Steel Channel W/ Light Hole & Length Options

    ROADWORKS

    $7.11 - $138.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRoadworks 3.5 Inch Stainless Steel Channel W/ Round 2 Inch Light Hole3.5 Inch Stainless Steel Channel...
    PPR_301347
    SKU:
    PPR_301347
    Length Options:
    30 Inch
    Length Options:
    60 Inch
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Height Options:
    3 1/2 Inch
    Length Options:
    36 Inch
    Length Options:
    3 1/2 Inch
    Length Options:
    86 Inch
    Length Options:
    6 3/4 Inch
    Length Options:
    18 Inch
    Light Options:
    Without Lights
    Length Options:
    42 Inch
    Length Options:
    88 Inch
    Product Type:
    Lighting
    Make:
    Universal Items
    $7.11 - $138.99
    Qty in Cart: 0
    Price:
    $7.11 - $138.99
    Subtotal:
  • Roadworks Stainless Steel Channel W/ Contoured Bar, Length & Oval Light Hole Options

    Roadworks Stainless Steel Channel W/ Contoured Bar, Length & Oval Light Hole Options

    ROADWORKS

    $15.72 - $72.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRoadworks 8.25 Inch Stainless Steel Channel W/ Contoured Bar & 1 Oval Light Hole8.25 Inch Stainless...
    PPR_301356
    SKU:
    PPR_301356
    Length Options:
    24 1/2 Inch
    Location:
    Made In USA
    Length Options:
    48 Inch
    Material Options:
    Stainless Steel
    Length Options:
    16 1/2 Inch
    Height Options:
    4 Inch
    Light Options:
    Without Lights
    Length Options:
    8 1/4 Inch
    Product Type:
    Lighting
    Make:
    Universal Items
    $15.72 - $72.99
    Qty in Cart: 0
    Price:
    $15.72 - $72.99
    Subtotal:
  • Roadworks Stainless Steel Channel W/ Length & Round Light Hole Options

    Roadworks Stainless Steel Channel W/ Length & Round Light Hole Options

    ROADWORKS

    $20.07 - $36.54
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRoadworks 6.5 Inch Stainless Steel Channel W/ 1 Round 4 inch Light Hole6.5 Inch Stainless Steel Channel...
    PPR_301352
    SKU:
    PPR_301352
    Height Options:
    6 1/2 Inch
    Location:
    Made In USA
    Length Options:
    13 Inch
    Material Options:
    Stainless Steel
    Product Type:
    Lighting
    Light Options:
    Without Lights
    Length Options:
    6 1/2 Inch
    Make:
    Universal Items
    $20.07 - $36.54
    Qty in Cart: 0
    Price:
    $20.07 - $36.54
    Subtotal:
  • Roadwork Stainless Steel Channel W/ Supernova Light Hole & Length Options

    Roadwork Stainless Steel Channel W/ Supernova Light Hole & Length Options

    ROADWORKS

    $13.84 - $135.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRoadworks 6.75 Inch Stainless Steel Channel W/ Supernova Light Hole6.75 Inch Stainless Steel Channel W/...
    PPR_301348
    SKU:
    PPR_301348
    Length Options:
    18 Inch
    Length Options:
    60 Inch
    Length Options:
    30 Inch
    Material Options:
    Stainless Steel
    Length Options:
    94 Inch
    Product Type:
    Lighting
    Style Options:
    Supernova
    Height Options:
    3 1/2 Inch
    Length Options:
    36 Inch
    Length Options:
    6 3/4 Inch
    Light Options:
    Without Lights
    Location:
    Made In USA
    Make:
    Universal Items
    $13.84 - $135.99
    Qty in Cart: 0
    Price:
    $13.84 - $135.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Multi Color Function Rigid Strip W/ 7 Selectable Colors & Length Options

    Multi Color Function Rigid Strip W/ 7 Selectable Colors & Length Options

    MAXXIMA

    $61.99 - $117.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksMulti Color Function Rigid Strip 12 Inch W/ 7 Selectable Colors & 33 LEDs12 Inch Multi Color Function...
    PPR_301232
    SKU:
    PPR_301232
    Height Options:
    114 Inch
    Product Type:
    Lighting
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $61.99 - $117.99
    Qty in Cart: 0
    Price:
    $61.99 - $117.99
    Subtotal:
  • Stainless Steel 30 Inch Mud Flap Hanger Spring Loaded W/ Optional Bolt Spacing

    Stainless Steel 30 Inch Mud Flap Hanger Spring Loaded W/ Optional Bolt Spacing

    TRUX ACCESSORIES

    $127.99 - $163.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of Trucks & TrailersStainless Steel Mud Flap Hangers 30 X 5.5 Inch W/ 1.125 Inch Bolt SpacingMud Flap Hangers 30...
    PPR_301248
    SKU:
    PPR_301248
    Finish Options:
    Mirror
    Material Options:
    Stainless Steel
    Product Type:
    Mud Flaps
    Width Options:
    30 Inch
    Make:
    Universal Items
    $127.99 - $163.99
    Qty in Cart: 0
    Price:
    $127.99 - $163.99
    Subtotal:
  • Hogebuilt Stainless Steel Quarter Fender Kit W/ 3 Inch Flange & Length Options For Peterbilt W/ Low Air Suspension

    Hogebuilt Stainless Steel Quarter Fender Kit W/ 3 Inch Flange & Length Options For Peterbilt W/ Low Air Suspension

    HOGEBUILT FENDERS

    $1,478.99 - $1,517.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 337 2011 thru 2023* Fits Peterbilt 352 1972 thru 1980* Fits Peterbilt...
    PPR_301233
    SKU:
    PPR_301233
    Product Type:
    Rear Fenders
    $1,478.99 - $1,517.99
    Qty in Cart: 0
    Price:
    $1,478.99 - $1,517.99
    Subtotal:
  • Rockwood Lower Door Kick Panel Flame Silhouette Design Stainless Steel Driver Side W/ Passenger Side Rectangular View Window Cutout For Peterbilt 359 & 370 Series

    Rockwood Lower Door Kick Panel Flame Silhouette Design Stainless Steel Driver Side W/ Passenger Side Rectangular View Window Cutout For Peterbilt 359 & 370 Series

    ROCKWOOD

    $128.99
    Lower Door Kick Panel Flame Silhouette Design Stainless Steel Driver Side W/ Passenger Side Rectangular View Window Cutout Fits Peterbilt 359 & 370 Series* High Quality Lower Door Kick Panel* Made Of...
    PDA164
    SKU:
    PDA164
    Product Type:
    Interior
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    $128.99
    Qty in Cart: 0
    Price:
    $128.99
    Subtotal:
  • Merritt Aluminum Cab Rack W/ Jail Bar Window & 2 Side Enclosures 86 X 68 X 9 Inch

    Merritt Aluminum Cab Rack W/ Jail Bar Window & 2 Side Enclosures 86 X 68 X 9 Inch

    MERRITT

    $5,806.99
    Diamond Plated Aluminum Cab Rack W/ 2 Chain Hangers* High Quality Cab Rack* Made Of Aluminum* Includes:  - Diamond Plated Body  - Jail Bar Window  - (2) Side Enclosures  - (2) Chain Hangers*...
    319381M0086
    SKU:
    319381M0086
    Product Type:
    Exterior
    Location:
    Made In USA
    Height Options:
    68 Inch
    Finish Options:
    Diamond Plate
    Width Options:
    86 Inch
    Material Options:
    Aluminum
    Make:
    Universal Items
    $5,806.99
    Qty in Cart: 0
    Price:
    $5,806.99
    Subtotal:
  • Merritt Aluminum Cab Rack W/ Radius Corners & Jail Bar Window 70 X 68 Inch

    Merritt Aluminum Cab Rack W/ Radius Corners & Jail Bar Window 70 X 68 Inch

    MERRITT

    $3,318.99
    Diamond Plated Aluminum Cab Rack W/ 2 Split Trays/Lids & 4 Inch Tall Foot Assembly* High Quality Cab Rack* Made Of Aluminum* Includes:  - Diamond Plated Body  - Radius Corners  - 4 Inch Tall Foot...
    317367C0446
    SKU:
    317367C0446
    Product Type:
    Exterior
    Material Options:
    Aluminum
    Location:
    Made In USA
    Height Options:
    68 Inch
    Finish Options:
    Diamond Plate
    Width Options:
    70 Inch
    Make:
    Universal Items
    $3,318.99
    Qty in Cart: 0
    Price:
    $3,318.99
    Subtotal:
  • Merritt Aluminum Tool Box Kit W/ Black Textured Double Doors 60 X 18 X 18 Inch

    Merritt Aluminum Tool Box Kit W/ Black Textured Double Doors 60 X 18 X 18 Inch

    MERRITT

    $2,095.99
    60 X 18 X 18 Inch Aluminum Tool Box Kit W/ Black Textured Double Doors By Merritt* High Quality Tool Box Kit* Made Of Aluminum* Includes:  - Aluminum Smooth Body  - Black Textured Double Doors*...
    291TBK
    SKU:
    291TBK
    Product Type:
    Toolboxes
    Length Options:
    60 Inch
    Width Options:
    18 Inch
    Height Options:
    18 Inch
    Position:
    Kit Full
    Material Options:
    Aluminum
    Location:
    Made In USA
    Make:
    Universal Items
    $2,095.99
    Qty in Cart: 0
    Price:
    $2,095.99
    Subtotal:
  • Roadworks Stainless Steel Hubcover 22.5 Inch W/ Disk Dana-Spicer Hubcover, Chrome Plastic Nut Covers & Mounting Hardware

    Roadworks Stainless Steel Hubcover 22.5 Inch W/ Disk Dana-Spicer Hubcover, Chrome Plastic Nut Covers & Mounting Hardware

    ROADWORKS

    $200.99
    Stainless Steel Hubcover 22.5 Inch W/ Disk Dana-Spicer Hubcover, Chrome Plastic Nut Covers & Mounting Hardware By Roadworks* High Quality Hubcover* Made Of 304 Stainless Steel* Polished Finish* For...
    29-2003030
    SKU:
    29-2003030
    Product Type:
    Wheels
    Material Options:
    Stainless Steel
    Location:
    Made In USA
    Finish Options:
    Polished
    Make:
    Universal Items
    $200.99
    Qty in Cart: 0
    Price:
    $200.99
    Subtotal:
  • Roadworks Stainless Steel Hubcover 22.5 Inch W/ Disk Dana-Spicer Hubcover & Mounting Hardware For Disk Hubcovers

    Roadworks Stainless Steel Hubcover 22.5 Inch W/ Disk Dana-Spicer Hubcover & Mounting Hardware For Disk Hubcovers

    ROADWORKS

    $184.99
    Stainless Steel Hubcover 22.5 Inch W/ Disk Dana-Spicer Hubcover & Mounting Hardware By Roadworks Fits Disk Hubcovers* High Quality Hubcover* Made Of 304 Stainless Steel* Polished Finish* For Disk...
    29-2003029
    SKU:
    29-2003029
    Product Type:
    Wheels
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Finish Options:
    Polished
    Make:
    Universal Items
    $184.99
    Qty in Cart: 0
    Price:
    $184.99
    Subtotal:
  • Roadworks Stainless Steel Hubcover 24.5 Inch

    Roadworks Stainless Steel Hubcover 24.5 Inch

    ROADWORKS

    $182.99
    * High Quality Hubcover* Made Of 304 Stainless Steel* Polished Finish* For Disk Hubcovers* Includes:  - Disk Dana-Spicer Hub Cover  - Mounting Hardware * 24.5 Inch Diameter Disk* Sold Individually*...
    29-2003031
    SKU:
    29-2003031
    Product Type:
    Wheels
    Finish Options:
    Polished
    Material Options:
    Stainless Steel
    Location:
    Made In USA
    Make:
    Universal Items
    $182.99
    Qty in Cart: 0
    Price:
    $182.99
    Subtotal:
  • Roadworks Stainless Steel Hubcover W/ Flame Dana-Spicer Hubcover & Mounting Hardware For Flame Drive Axle Hubcovers

    Roadworks Stainless Steel Hubcover W/ Flame Dana-Spicer Hubcover & Mounting Hardware For Flame Drive Axle Hubcovers

    ROADWORKS

    $114.99
    Stainless Steel Hubcover W/ Flame Dana-Spicer Hubcover & Mounting Hardware By Roadworks Fits Flame Drive Axle Hubcovers* High Quality Hubcover* Made Of 304 Stainless Steel* Polished Finish* For Flame...
    29-2003027
    SKU:
    29-2003027
    Product Type:
    Wheels
    Finish Options:
    Polished
    Material Options:
    Stainless Steel
    Location:
    Made In USA
    Make:
    Universal Items
    $114.99
    Qty in Cart: 0
    Price:
    $114.99
    Subtotal:
  • Roadworks Stainless Steel Inner Breather Light Panel W/ 12 Bullseye Light Holes For Peterbilt W/ 13 Inch Donaldson Breather

    Roadworks Stainless Steel Inner Breather Light Panel W/ 12 Bullseye Light Holes For Peterbilt W/ 13 Inch Donaldson Breather

    ROADWORKS

    $117.99
    Stainless Steel Inner Breather Light Panel W/ 12 Bullseye Light Holes By Roadworks Fits 13 Inch Donaldson Breather* High Quality Inner Breather Light Panel* Made Of 430 Stainless Steel* Fits 13 Inch...
    29-0905110
    SKU:
    29-0905110
    Product Type:
    Exterior
    Light Options:
    Without Lights
    Diameter Options:
    13 Inch
    Material Options:
    Stainless Steel
    Location:
    Made In USA
    Make:
    Peterbilt
    $117.99
    Qty in Cart: 0
    Price:
    $117.99
    Subtotal:
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Adding your products to cart

The Peterbilt 357 and 378 are known for their no-nonsense durability and old-school style. Whether you’re hauling heavy loads or running construction jobs, these workhorses are built to last—and we’re here to help you keep them in top shape.

Why Choose Aftermarket Peterbilt 357/378 Truck Parts?

- Engineered for your model: Every part is made to fit and function with your 357 or 378—so you can skip the guesswork and get back to work. - Performance you can count on: Keep your truck running strong with engine, transmission, suspension, fiberglass Pete 357/378 hood shells, LED headlights, and cab lighting accessories designed to turn heads. - Trusted brands, proven quality: We only carry parts from manufacturers we trust, so you know you're getting durable, road-tested gear. - Quick shipping, expert help: Get your parts fast and reach out to our team if you need help finding the right fit—we’ve got your back.

Shop the Perfect Aftermarket Accessories for Peterbilt 357/378 Trucks


Whether you're restoring a classic or keeping your work truck rolling, our Peterbilt 357 and 378 parts are built to match the strength and legacy of these iconic models. We stock a wide selection of aftermarket and replacement parts designed specifically for Peterbilt 357 and 378 models. From critical mechanical components to sleek interior cab accessory upgrades, we’ve got what you need to maintain, repair, or customize your rig. Explore our full selection and get the parts you need to keep your rig road-ready.

Frequently Asked Questions About Peterbilt 357/378 Parts

What years and models are compatible with Peterbilt 357/378 parts?

Most aftermarket parts for Peterbilt 357/378 trucks are designed to fit models from 1987 through 2007. However, there are important differences between early models (1987-1999) and later models (2000-2007), particularly in hood mounting points and grille configurations. Always verify the specific year range listed for each part, as some components like bumpers and fenders may have changed mounting hole patterns after the 2000 model year update.

Are aftermarket bumpers as durable as OEM Peterbilt bumpers?

Quality aftermarket bumpers are typically made from 16-gauge steel (same as OEM) and feature triple chrome plating or powder coating for corrosion resistance. The main differences you'll find are in the finishing details and fitment precision. While a well-made aftermarket bumper can last just as long as OEM, pay attention to the warranty offered - reputable manufacturers typically provide at least a 1-year warranty on chrome finish and 3-5 years on structural integrity.

What tools and modifications are needed to install replacement parts?

Most bolt-on parts like bumpers, grilles, and headlight assemblies require basic hand tools including socket sets (typically 1/2" to 3/4"), wrenches, and a drill with metal bits for any minor adjustments. Common installation challenges include slight drilling to align mounting holes (especially on pre-2000 models) and adjusting bumper brackets for proper fitment. Professional installation typically takes 2-4 hours for major components like bumpers or hoods.

What's the difference between chrome, stainless steel, and painted finishes?

Chrome-plated steel offers the brightest mirror finish but requires regular polishing and can pit in harsh climates. Stainless steel (usually 304 grade) provides excellent corrosion resistance with less maintenance but has a slightly duller appearance. Painted finishes are the most economical and can be color-matched to your truck, but may need repainting every 5-7 years depending on exposure. For winter driOEMg or coastal areas, stainless steel typically offers the best long-term value.

How do I ensure proper fitment when ordering hoods, fenders, or bumpers?

Start by confirming your exact model year and checking whether you have a standard or extended hood configuration. Measure key mounting points on your current parts before ordering - bumper width should be either 18" or 20" depending on your model. For hoods and fenders, verify whether you have the single-headlight or dual-headlight configuration. When in doubt, provide your OEM number when ordering to ensure compatibility, as some mid-year production changes aren't reflected in standard model year listings.


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