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Peterbilt 388 Frame Crossmembers & Covers

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  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • 3.5 X 42 Inch Stainless Steel Blank Channel

    3.5 X 42 Inch Stainless Steel Blank Channel

    ROADWORKS

    $65.99
    3.5 X 42 Inch Blank ChannelPerfect for truck builders and custom fabricators, the 3.5 x 42 Inch Stainless Steel Blank Channel delivers both strength and style. Crafted from stainless steel with a...
    09-01060162
    SKU:
    09-01060162
    Location:
    Made In USA
    Product Type:
    Bumpers
    Light Options:
    Without Lights
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    $65.99
    Qty in Cart: 0
    Price:
    $65.99
    Subtotal:
  • 24 Inch Chrome Plated Aluminum Step Plate W/ Logo Cutout Rubber Insert For Peterbilt

    24 Inch Chrome Plated Aluminum Step Plate W/ Logo Cutout Rubber Insert For Peterbilt

    LIFETIME NUT COVERS

    $697.99
    24 Inch Step Plate With Logo Cutout Rubber InsertAdd a bold, professional finish to your ride with this high-quality 24 Inch Chrome Step Plate for Peterbilt models. The billet aluminum body shines...
    01-050500008
    SKU:
    01-050500008
    Finish Options:
    Chrome-Plated
    Location:
    Made In USA
    Length Options:
    24 Inch
    Material Options:
    Billet Aluminum
    Height Options:
    6 Inch
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    $697.99
    Qty in Cart: 0
    Price:
    $697.99
    Subtotal:
  • Air Disc Brake Chamber Replaces SC20D, 5396SC20D

    Air Disc Brake Chamber Replaces SC20D, 5396SC20D

    AFTERMARKET

    $111.99
    Type 20 Air Disc Brake CamberEnsure reliable stopping power for your heavy-duty truck with this high-quality Air Disc Brake Chamber. Engineered as a Type 20 chamber, it features an M16 x 1.5 bolt...
    29-051700042
    SKU:
    29-051700042
    Height Options:
    4 1/2 Inch
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $111.99
    Qty in Cart: 0
    Price:
    $111.99
    Subtotal:
  • Panel Mount Flipper Control Valve Replaces 229617, 229635, 229635N, 228729, 14651, 233699R91, 308814651, KN20001, R955229635N, 110167, 216002

    Panel Mount Flipper Control Valve Replaces 229617, 229635, 229635N, 228729, 14651, 233699R91, 308814651, KN20001, R955229635N, 110167, 216002

    AUTOMANN USA

    $9.18
    TW1 Type Control ValveAchieve dependable braking control with the Panel Mount Flipper Control Valve, a high-quality replacement for multiple OEM part numbers. With a 2.50-inch height, panel mount...
    29-051402
    SKU:
    29-051402
    Height Options:
    2 1/2 Inch
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $9.18
    Qty in Cart: 0
    Price:
    $9.18
    Subtotal:
  • Spring Brake Valve With Anti- Compounding Replaces 65437, 109615, R95565437N, 034035

    Spring Brake Valve With Anti- Compounding Replaces 65437, 109615, R95565437N, 034035

    AUTOMANN USA

    $79.99
    SR5 Type Spring Brake ValveExperience superior air brake control with the Spring Brake Valve with Anti-Compounding, a high-quality SR5 type valve engineered for reliability and longevity. Its...
    29-051700029
    SKU:
    29-051700029
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $79.99
    Qty in Cart: 0
    Price:
    $79.99
    Subtotal:
  • Camshaft Repair Kit Replaces E3993B, KIT8042, CQ67387, 43-7048

    Camshaft Repair Kit Replaces E3993B, KIT8042, CQ67387, 43-7048

    AUTOMANN USA

    $19.48
    Camshaft Repair Kit For Meritor 15in and 16-1/2in Q & Q-Plus Type Drive AxlesExperience reliable performance and extended service life with this Camshaft Repair Kit, crafted for Meritor 15-inch and...
    29-051700027
    SKU:
    29-051700027
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $19.48
    Qty in Cart: 0
    Price:
    $19.48
    Subtotal:
  • 5.5-6.5 Inch Automatic Slack Adjuster For Drive Axle Replaces 818552, 97353, E6924B, 40010121, 40910649, 40910733, M807022, R806022, 0305886

    5.5-6.5 Inch Automatic Slack Adjuster For Drive Axle Replaces 818552, 97353, E6924B, 40010121, 40910649, 40910733, M807022, R806022, 0305886

    AUTOMANN USA

    $86.99
    5.5-6.5 Inch Haldex Type Automatic Slack Adjuster For Drive AxleImprove your Haldex drive axle braking with the 5.5-6.5 Inch Automatic Slack Adjuster. This high-quality automatic adjuster features a...
    09-051700019
    SKU:
    09-051700019
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $86.99
    Qty in Cart: 0
    Price:
    $86.99
    Subtotal:
  • 16.5 X 7 Inch 10 Hole Brake Drum Replaces 3166, 3122607002, 56893F, 66853, 66893, 66893F

    16.5 X 7 Inch 10 Hole Brake Drum Replaces 3166, 3122607002, 56893F, 66853, 66893, 66893F

    AUTOMANN USA

    $320.99
    10 Hole 16.5 X 7 Inch Brake DrumReplace worn-out brake drums with the 16.5 X 7 Inch 10-Hole Brake Drum for precision performance and safety. This high-quality drum features ten 0.810-inch bolt holes,...
    09-051700022
    SKU:
    09-051700022
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $320.99
    Qty in Cart: 0
    Price:
    $320.99
    Subtotal:
  • 6.5 Inch Automatic Slack Adjuster Replaces E-11403, E11403, R802512

    6.5 Inch Automatic Slack Adjuster Replaces E-11403, E11403, R802512

    AUTOMANN USA

    $85.99
    6.5 Inch Meritor Type Automatic Slack AdjusterMaintain safe and consistent braking with the 6.5 Inch Automatic Slack Adjuster for Meritor Type A systems. This high-quality automatic adjuster comes...
    09-051700017
    SKU:
    09-051700017
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $85.99
    Qty in Cart: 0
    Price:
    $85.99
    Subtotal:
  • Smooth Aluminum Step Box W/ Smooth Lid- 30 X 29.13 X 24 Inch

    Smooth Aluminum Step Box W/ Smooth Lid- 30 X 29.13 X 24 Inch

    ICONIC

    $879.99
    30 X 29.13 X 24 Inch Smooth Aluminum Step Box W/ Smooth LidOptimize your truck storage with this 30 x 29.13 x 24 Inch Smooth Aluminum Step Box. Featuring a smooth aluminum lid, step tread, and...
    09-020100555
    SKU:
    09-020100555
    Height Options:
    24 Inch
    Finish Options:
    Smooth
    Width Options:
    29 Inch
    Product Type:
    Toolboxes
    Length Options:
    30 Inch
    Material Options:
    Aluminum
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $879.99
    Qty in Cart: 0
    Price:
    $879.99
    Subtotal:
  • U Joint Set Replaces SPL2503X, 61250, US250X

    U Joint Set Replaces SPL2503X, 61250, US250X

    AFTERMARKET

    $100.99
    SPL250 Series U Joint SetProtect your truck's drivetrain with this high-quality Universal U-Joint Set, designed to replace SPL2503X, 61250, and US250X. The greaseable spring-tab design allows for...
    09-05210038
    SKU:
    09-05210038
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $100.99
    Qty in Cart: 0
    Price:
    $100.99
    Subtotal:
  • 5th Wheel Left Hand Rebuild Kit Replaces KITRPR6000L, RPR6000L, 3092792, 85105401

    5th Wheel Left Hand Rebuild Kit Replaces KITRPR6000L, RPR6000L, 3092792, 85105401

    AFTERMARKET

    $108.99
    5th Wheel Rebuild Kit- Left HandRestore your Fontaine 5th wheel assembly with the Left Hand Rebuild Kit, designed for precision and durability. The kit includes a step jaw, wedge, three handle...
    09-051100929
    SKU:
    09-051100929
    Position:
    Driver Side
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $108.99
    Qty in Cart: 0
    Price:
    $108.99
    Subtotal:
  • 5th Wheel Left Hand Minor Rebuild Kit Replaces SK7322150Z

    5th Wheel Left Hand Minor Rebuild Kit Replaces SK7322150Z

    AFTERMARKET

    $159.99
    5th Wheel Minor Rebuild Kit- Left HandOptimize your 5th wheel's performance with the Left Hand Minor Rebuild Kit, specifically designed for JSK37 series wheels. The kit comes with a top plate, lock...
    09-051100930
    SKU:
    09-051100930
    Product Type:
    Frame & Chassis
    Position:
    Driver Side
    Make:
    Universal Items
    $159.99
    Qty in Cart: 0
    Price:
    $159.99
    Subtotal:
  • Power Steering Reservoir Replaces J86-1047-001 For Peterbilt

    Power Steering Reservoir Replaces J86-1047-001 For Peterbilt

    AFTERMARKET

    $271.99
    Power Steering ReservoirThis Power Steering Reservoir is engineered as a direct fit replacement for Peterbilt trucks, superseding part number J86-1047-001. Its robust construction helps prevent leaks...
    01-0714005
    SKU:
    01-0714005
    Diameter Options:
    6 1/4 Inch
    Height Options:
    4 Inch
    Product Type:
    Engine Parts
    Make:
    Peterbilt
    $271.99
    Qty in Cart: 0
    Price:
    $271.99
    Subtotal:
  • 17 Inch Stainless Steel Air Cleaner Light Panel W/ 16 3/4 Inch Light Holes

    17 Inch Stainless Steel Air Cleaner Light Panel W/ 16 3/4 Inch Light Holes

    ARANDA TRUCK ACCESSORIES

    $215.99
    17 Inch Air Cleaner Light Panel W/ 16 3/4 Inch Light HolesGive your truck a sleek, custom look with the 17 Inch Stainless Steel Air Cleaner Light Panel with 16 3/4 Inch Light Holes, designed to...
    29-09050069
    SKU:
    29-09050069
    Product Type:
    Exterior
    Height Options:
    17 Inch
    Size Options:
    18 Gauge
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    $215.99
    Qty in Cart: 0
    Price:
    $215.99
    Subtotal:
  • 1-1/2 Inch Front Leaf Spring Replaces B816065001

    1-1/2 Inch Front Leaf Spring Replaces B816065001

    AUTOMANN USA

    $698.99
    1-1/2 Inch Front Leaf SpringRestore your truck's front suspension to peak condition with the 1-1/2 Inch Front Leaf Spring, a durable, high-quality replacement designed for heavy-duty use. Replacing...
    29-05090252
    SKU:
    29-05090252
    Product Type:
    Frame & Chassis
    Length Options:
    1 1/2 Inch
    Make:
    Universal Items
    $698.99
    Qty in Cart: 0
    Price:
    $698.99
    Subtotal:
  • Stainless Steel Light Brackets With 3/4 Inch Light Hole- Pitch Mount

    Stainless Steel Light Brackets With 3/4 Inch Light Hole- Pitch Mount

    ROADWORKS

    $57.99
    Pitch Mount Light Brackets With 3/4 Inch Light HoleMount your lights with confidence using these Stainless Steel Light Brackets with 3/4 Inch Light Hole - Pitch Mount. Made from premium stainless...
    09-161000045
    SKU:
    09-161000045
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Location:
    Made In USA
    Light Options:
    Without Lights
    Product Type:
    Frame & Chassis
    $57.99
    Qty in Cart: 0
    Price:
    $57.99
    Subtotal:
  • 18 Inch Chrome Round Bell Horn W/ Pedestal & Gaskets

    18 Inch Chrome Round Bell Horn W/ Pedestal & Gaskets

    OPP - ORIGINAL PARTS PROGRAM

    $327.99
    18 Inch Chrome Round Bell HornUpgrade your truck's sound system with this 18 Inch Chrome Round Bell Horn, built for truckers who demand loud, reliable, and professional-grade performance. Featuring a...
    09-051300126
    SKU:
    09-051300126
    Product Type:
    Frame & Chassis
    Diameter Options:
    6 Inch
    Length Options:
    18 Inch
    Finish Options:
    Chrome-Plated
    Make:
    Universal Items
    Ready To Ship:
    Yes
    Material Options:
    Steel
    $327.99
    Qty in Cart: 0
    Price:
    $327.99
    Subtotal:
  • 28.25 Inch Chrome Plastic Air Horn- 115 DB Output

    28.25 Inch Chrome Plastic Air Horn- 115 DB Output

    AUTOMANN USA

    $87.99
    28.25 Inch Chrome Plastic Air HornCommand attention on the highway with the 28.25 Inch Chrome Plastic Air Horn, designed to produce a robust 115 DB sound that enhances safety for truck drivers. Its...
    09-051300125
    SKU:
    09-051300125
    Product Type:
    Frame & Chassis
    Material Options:
    Plastic/Poly
    Diameter Options:
    6 Inch
    Length Options:
    28 Inch
    Finish Options:
    Chrome-Plated
    Make:
    Universal Items
    $87.99
    Qty in Cart: 0
    Price:
    $87.99
    Subtotal:
  • 3.5 X 48 Inch Stainless Steel Channel W/ 5 Supernova Light Holes

    3.5 X 48 Inch Stainless Steel Channel W/ 5 Supernova Light Holes

    ROADWORKS

    $65.99
    3.5 X 48 Inch Channel W/ 5 Supernova Light HolesBring both durability and style to your truck with this 3.5 x 48 Inch Stainless Steel Channel with 5 Supernova light holes. Constructed from...
    09-010600155
    SKU:
    09-010600155
    Light Options:
    Without Lights
    Location:
    Made In USA
    Product Type:
    Frame & Chassis
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Length Options:
    48 Inch
    $65.99
    Qty in Cart: 0
    Price:
    $65.99
    Subtotal:
  • Total: items /

Adding your products to cart

Enhance your Peterbilt 388 with durable Peterbilt 377, 378, 388, and 389 frame crossmembers and stylish covers. From stainless steel and aluminum options to fiberglass and steel designs, this product lineup offers a variety of high-quality products to protect your truck's rear frame. Keep your rig looking its best with customizable covers that feature notch cutouts, light openings, and emblem mounts. Plus, find the right walking beam components to ensure a smooth, comfortable ride. Whether you're restoring a classic Peterbilt or upgrading a newer model, this collection of frame crossmembers and covers has everything you need to elevate your Peterbilt 388's appearance and functionality.

Frequently Asked Questions About Peterbilt 388 Frame Crossmembers & Covers

What are frame crossmembers and covers used for on a Peterbilt 388?

Frame crossmembers are structural components that run horizontally between the frame rails, providing rigidity and support for the chassis, while covers protect these areas from road debris, moisture, and corrosion. Together they help maintain frame integrity and give the underside of the truck a cleaner, finished appearance.

Will these crossmembers and covers fit my specific Peterbilt 388 configuration?

Fitment can vary depending on wheelbase, frame rail spacing, and whether your truck has factory or aftermarket modifications. It is important to check the listed specifications and, when possible, compare part numbers with your truck's build sheet or consult with our parts team before ordering to confirm a proper fit.

What materials are these parts made from, and how well do they hold up over time?

Most crossmembers and covers are constructed from steel or aluminum, depending on the specific part and application. Steel components typically offer strength and durability for structural crossmembers, while aluminum covers are often chosen for their corrosion resistance and lighter weight. Finish options may include raw metal, painted, or powder-coated surfaces to help resist rust and wear from daily use.

Can I install a crossmember or cover myself, or should I have a professional do it?

Covers are generally straightforward to install with basic tools and can often be handled by anyone comfortable with routine truck maintenance. Structural crossmembers, however, are load-bearing components, and improper installation can affect frame integrity and safety. For crossmember replacement or modification, we recommend having the work done by a qualified technician familiar with frame repairs.

How do I know if my current crossmember or cover needs to be replaced?

Common signs include visible rust or corrosion, cracks, bending, loose or missing mounting hardware, or a cover that no longer sits flush and allows debris underneath. If you notice any flexing or unusual noise from the frame area while driving, it is a good idea to have the crossmember inspected as soon as possible.


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