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Peterbilt 388 Frame Crossmembers & Covers

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  • On Sale
    Limited Quantity Available
    CSM Mounting Kit For CSM 18 x 18 x 36 Inch Toolboxes

    CSM Mounting Kit For CSM 18 x 18 x 36 Inch Toolboxes

    CHROME SHOP MAFIA

    Now: $160.06
    Was: $234.99
    18 x 18 x 36 Inch Tool Box Mounting Kit W/ Bottom & Triangle Side Supports By Chrome Shop Mafia* High Quality Mounting Kit* Made Of Black Powder Coated Steel* 18 Inch X 18 Inch X 36 Inch * 1 Piece...
    09-020118361
    SKU:
    09-020118361
    Length Options:
    18 Inch
    Color:
    Black
    Truck Class:
    Universal
    Width Options:
    18 Inch
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Now: $160.06
    Was: $234.99
    Qty in Cart: 0
    Price:
    Now: $160.06
    Was: $234.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    CSM Mounting Kit For CSM 18 x 18 x 48 Inch Toolboxes

    CSM Mounting Kit For CSM 18 x 18 x 48 Inch Toolboxes

    CHROME SHOP MAFIA

    Now: $169.43
    Was: $254.99
    18 x 18 x 48 Inch Tool Box Mounting Kit W/ Bottom & Triangle Side Supports By Chrome Shop Mafia* High Quality Mounting Kit* Made Of Black Powder Coated Steel* 18 Inch X 18 Inch X 48 Inch * 1 Piece...
    09-020118481
    SKU:
    09-020118481
    Length Options:
    18 Inch
    Color:
    Black
    Truck Class:
    Universal
    Width Options:
    18 Inch
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Cargo Control
    Ready To Ship:
    Yes
    Now: $169.43
    Was: $254.99
    Qty in Cart: 0
    Price:
    Now: $169.43
    Was: $254.99
    Subtotal:
  • Spring Brake Chamber Type 30/30 Long Stroke W/ Welded Clevis

    Spring Brake Chamber Type 30/30 Long Stroke W/ Welded Clevis

    AFTERMARKET

    $144.99
    Maintain superior braking performance with the BESTfit 30/30 Long Stroke Spring Brake Chamber with Welded Clevis, engineered for heavy-duty trucks requiring reliable stopping power. Its long-stroke...
    PPR_206049
    SKU:
    PPR_206049
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Length Options:
    3 Inch
    Product Type:
    Frame & Chassis
    $144.99
    Qty in Cart: 0
    Price:
    $144.99
    Subtotal:
  • U Shaped Air Disc Brake Rotor For Mercedes, Setra

    U Shaped Air Disc Brake Rotor For Mercedes, Setra

    AFTERMARKET

    $363.99 - $580.99
    Choose Option(s) to see description.17 Inch Air Disc Brake Rotor 6231000870. A6274210012 For Mercedes, SetraU Shaped 10 Hole Air Disc Rotor 17 Inch* High Quality Air Disc Rotor* Disc O.D.- 17.00...
    PPR_206050
    SKU:
    PPR_206050
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    $363.99 - $580.99
    Qty in Cart: 0
    Price:
    $363.99 - $580.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    FREE SHIPPING OVER $249
    CSM Corrugated Floor Plate For CSM Heavy Duty Aluminum Tool Boxes

    CSM Corrugated Floor Plate For CSM Heavy Duty Aluminum Tool Boxes

    CHROME SHOP MAFIA

    $32.23 - $114.99
    Upgrade your CSM Heavy Duty Aluminum Tool box with the CSM Corrugated Floor Plate. Constructed from high-quality aluminum, this replacement floor plate features a corrugated design that enhances...
    PPR_206065
    SKU:
    PPR_206065
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Length Options:
    48 Inch
    Length Options:
    36 Inch
    Width Options:
    18 Inch
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    $32.23 - $114.99
    Qty in Cart: 0
    Price:
    $32.23 - $114.99
    Subtotal:
  • 16.929 Inch Hat Shape Air Disc Brake Rotor - R6206, R6206M, M44D6206, R44D6206 For Haldex DB22

    16.929 Inch Hat Shape Air Disc Brake Rotor - R6206, R6206M, M44D6206, R44D6206 For Haldex DB22

    AUTOMANN USA

    $386.99
    16.929 Inch Haldex DB22 Air Disc Rotor W/ Threaded Bolt Holes* High Quality Air Disc Rotor * 16.929 Inch * Haldex Db22 * Threaded Bolt Holes * Disc Brake Shape- Hat Shape * Disc OD - 16.929 Inch *...
    29-051700017
    SKU:
    29-051700017
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $386.99
    Qty in Cart: 0
    Price:
    $386.99
    Subtotal:
  • Type 30/30 Sealed Brake Chamber 3 Inch Long Stroke Welded Clevis

    Type 30/30 Sealed Brake Chamber 3 Inch Long Stroke Welded Clevis

    AUTOMANN USA

    $131.99
    Long Stroke Welded Clevis Spring Brake W/ 3 Inch Stroke LengthDepend on the Type 30/30 Sealed Brake Chamber - 3 Inch Long Stroke Welded Clevis for consistent and efficient braking. This high-quality...
    09-151700004
    SKU:
    09-151700004
    Truck Class:
    Universal
    Length Options:
    3 Inch
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • Service Chamber W/ Type, Push Rod Length & Chamber Length Options

    Service Chamber W/ Type, Push Rod Length & Chamber Length Options

    AFTERMARKET

    $78.99 - $98.99
    Maintain confident stopping power with this service chamber built for commercial brake systems that demand reliability and precision. Available in Type 16, 20, 24, and 30 configurations with multiple...
    PPR_205993
    SKU:
    PPR_205993
    Truck Class:
    Universal
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    $78.99 - $98.99
    Qty in Cart: 0
    Price:
    $78.99 - $98.99
    Subtotal:
  • Air Disc Brake Pads

    Air Disc Brake Pads

    AUTOMANN USA

    $142.99 - $170.99
    Maintain top-tier braking performance with BESTfit Air Disc Brake Pads, available in Severe Duty and Fleet Standard options. Both types feature high-quality friction materials to reduce rotor wear...
    PPR_205889
    SKU:
    PPR_205889
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Make:
    Bus
    Make:
    Volvo
    Make:
    Sterling
    Make:
    Mack
    Make:
    Freightliner
    Material Options:
    Steel
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $142.99 - $170.99
    Qty in Cart: 0
    Price:
    $142.99 - $170.99
    Subtotal:
  • 15 x 5 Inch 10 Hole Brake Drum

    15 x 5 Inch 10 Hole Brake Drum

    AFTERMARKET

    $344.99 - $467.99
    Choose the perfect 15 x 5 Inch 10 Hole Brake Drum for your heavy-duty truck with five distinct options, each designed to replace specific OEM numbers and deliver precision performance. Each with...
    PPR_205888
    SKU:
    PPR_205888
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Height Options:
    15 Inch
    Diameter Options:
    15 Inch
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    $344.99 - $467.99
    Qty in Cart: 0
    Price:
    $344.99 - $467.99
    Subtotal:
  • Go Rhino Black Textured Steel Dominator Dual Step For 2 Inch Hitch

    Go Rhino Black Textured Steel Dominator Dual Step For 2 Inch Hitch

    GO RHINO

    $167.99
    Black Textured Steel Dominator Hitch Dual StepReach the roof or hard to get reach storage areas on your truck safely with this Go Rhino Dominator Dual Step. It is made of a mild steel with a textured...
    D360T
    SKU:
    D360T
    Truck Class:
    Light Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Color:
    Black
    Length Options:
    36 Inch
    Product Type:
    Frame & Chassis
    $167.99
    Qty in Cart: 0
    Price:
    $167.99
    Subtotal:
  • Go Rhino Black Textured Steel Step For 2 Inch Hitch

    Go Rhino Black Textured Steel Step For 2 Inch Hitch

    GO RHINO

    $165.99
    Black Textured Mild Steel Universal Rear Hitch Step - 2 InchImprove access to your truck bed, rack, or roof with this universal Rhino Hitch Step that will fit on any 2 inch hitch receiver. With three...
    360T
    SKU:
    360T
    Truck Class:
    Light Duty
    Make:
    Universal Items
    Material Options:
    Steel
    Color:
    Black
    Product Type:
    Frame & Chassis
    $165.99
    Qty in Cart: 0
    Price:
    $165.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    5th Wheel Hook & Pull Strap Puller W/ 4 State Trucks Logo

    5th Wheel Hook & Pull Strap Puller W/ 4 State Trucks Logo

    AFTERMARKET

    Now: $14.40
    Was: $27.53
    5th Wheel Strap Puller W/ 4 State Trucks Embroidery* High Quality 5th Wheel Strap Puller * Hook And Pull* 4 State Trucks Embroidered* Collapses Down For Easy Storage* Made In USA* Sold Individually*...
    09-051100010
    SKU:
    09-051100010
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Now: $14.40
    Was: $27.53
    Qty in Cart: 0
    Price:
    Now: $14.40
    Was: $27.53
    Subtotal:
  • 7/8 x 15/16 Inch Chrome Plastic Top Hat Nut Cover

    7/8 x 15/16 Inch Chrome Plastic Top Hat Nut Cover

    GRAND GENERAL

    $1.58
    Chrome Plated Top Hat Style Nut Cover* High Quality Nut Cover* Chrome-Plated Plastic* 7/8 x 15/16 Inch* Flat Top Hat Style* Sold Individually* Warranty On Nut Covers Against Defects In Workmanship &...
    09-0506104
    SKU:
    09-0506104
    Truck Class:
    Universal
    Style Options:
    Flat
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $1.58
    Qty in Cart: 0
    Price:
    $1.58
    Subtotal:
  • Twelve Gauge Stainless Steel Fuel Tank I-Panel W/ Options For Peterbilt

    Twelve Gauge Stainless Steel Fuel Tank I-Panel W/ Options For Peterbilt

    TWELVE GAUGE

    $662.99 - $713.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 330 1995 thru 2005* Fits Peterbilt 335 2005 thru 2010* Fits Peterbilt 352 1972 thru 1980* Fits Peterbilt 357 1987 thru 2007* Fits Peterbilt...
    PPR_205832
    SKU:
    PPR_205832
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Finish Options:
    Paintable
    Length Options:
    26 Inch
    Light Options:
    Without Lights
    Type Options:
    Cab Mount
    Style Options:
    Grass Burner Exhaust
    Length Options:
    23 Inch
    Size Options:
    16 Gauge
    Style Options:
    Vertical
    Product Type:
    Fuel Tanks
    Ready To Ship:
    Yes
    Diameter Options:
    26 Inch
    $662.99 - $713.99
    Qty in Cart: 0
    Price:
    $662.99 - $713.99
    Subtotal:
  • Limited Quantity Available
    FREE SHIPPING OVER $249
    Chrome Spike Nut Covers For Hex Nuts - Push On

    Chrome Spike Nut Covers For Hex Nuts - Push On

    UNITED PACIFIC

    $0.79 - $74.99
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Trucks and Trailers1/2 X 1 7/16 Inch Chrome Spike Nut Covers - Push On - 10 PackChrome Plated Plastic Push On Nut Covers W/...
    PPR_205713
    SKU:
    PPR_205713
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Style Options:
    Spike
    Diameter Options:
    1 1/8 Inch
    Diameter Options:
    3/4 Inch
    Length Options:
    1 1/2 Inch
    Length Options:
    2 1/2 Inch
    Location:
    Made In USA
    Diameter Options:
    11/16 Inch
    Diameter Options:
    7/16 Inch
    Diameter Options:
    1/2 Inch
    Length Options:
    1 7/8 Inch
    Diameter Options:
    15/16 Inch
    Diameter Options:
    5/8 Inch
    Length Options:
    2 3/4 Inch
    Diameter Options:
    9/16 Inch
    Length Options:
    1 1/4 Inch
    Type Options:
    Push On
    Length Options:
    2 1/16 Inch
    Length Options:
    2 1/4 Inch
    Length Options:
    2 Inch
    Product Type:
    Wheels
    Ready To Ship:
    Yes
    Diameter Options:
    2 Inch
    Height Options:
    5/8 Inch
    $0.79 - $74.99
    Qty in Cart: 0
    Price:
    $0.79 - $74.99
    Subtotal:
  • Merritt 22 X 21 Inch Top Opening Smooth Aluminum Saddle Box With Diamond Plate Door, No Step

    Merritt 22 X 21 Inch Top Opening Smooth Aluminum Saddle Box With Diamond Plate Door, No Step

    MERRITT

    $1,115.99 - $1,448.99
    Have equipment organized in the Merritt 22 x 21 Inch Top Opening Smooth Aluminum Saddle Box with Diamond Plate Door. Built from smooth aluminum and featuring a rugged diamond plate door, this...
    PPR_204401
    SKU:
    PPR_204401
    Truck Class:
    Universal
    Location:
    Made In USA
    Length Options:
    21 Inch
    Material Options:
    Aluminum
    Make:
    Universal Items
    Finish Options:
    Smooth
    Width Options:
    22 Inch
    Style Options:
    1 Door
    Truck Class:
    Heavy Duty
    Product Type:
    Toolboxes
    $1,115.99 - $1,448.99
    Qty in Cart: 0
    Price:
    $1,115.99 - $1,448.99
    Subtotal:
  • Go Rhino 48 Inch Black Textured Galvanized Steel Running Board Side Step

    Go Rhino 48 Inch Black Textured Galvanized Steel Running Board Side Step

    GO RHINO

    $351.07
    Textured Black Galvanized Steel Running Boards & Side Steps* High Quality Running Boards-Side Steps* Replacement Running Boards Only, Brackets Not Included* Galvanized Steel* Textured Black Coating*...
    69400048PC
    SKU:
    69400048PC
    Truck Class:
    Light Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Color:
    Black
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $351.07
    Qty in Cart: 0
    Price:
    $351.07
    Subtotal:
  • Go Rhino 6 X 80 Inch Xtreme Low Profile Stainless Steel Side Bars/ Steps

    Go Rhino 6 X 80 Inch Xtreme Low Profile Stainless Steel Side Bars/ Steps

    GO RHINO

    $582.07
    Universal Extreme Low Profile Stainless Steel Side Bars & Steps* High Quality Side Bars/Steps* Stainless Steel * Low Profile* 6 Inch X 80 Inch * No Drilling Required* Cab Length* Sold Individually*...
    660080PS
    SKU:
    660080PS
    Truck Class:
    Light Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Finish Options:
    Polished
    Product Type:
    Frame & Chassis
    $582.07
    Qty in Cart: 0
    Price:
    $582.07
    Subtotal:
  • Go Rhino 6 X 87 Inch Xtreme Low Profile Black Textured Steel Side Bars

    Go Rhino 6 X 87 Inch Xtreme Low Profile Black Textured Steel Side Bars

    GO RHINO

    $528.94
    Universal Extreme Low Profile Black Textured Steel Side Bars & Steps* High Quality Side Bars/Steps* Galvanized Steel* Textured Black * Low Profile * 6 Inch X 87 Inch * No Drilling Required* Cab...
    660087T
    SKU:
    660087T
    Truck Class:
    Light Duty
    Make:
    Universal Items
    Material Options:
    Steel
    Color:
    Black
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $528.94
    Qty in Cart: 0
    Price:
    $528.94
    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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