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Peterbilt 388 Frame Crossmembers & Covers

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  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Go Rhino 5 X 80 Inch Xtreme Low Profile Stainless Steel Side Bars / Steps

    Go Rhino 5 X 80 Inch Xtreme Low Profile Stainless Steel Side Bars / Steps

    GO RHINO

    $478.12
    Universal Extreme Low Profile Stainless Steel Side Bars & Steps* High Quality Side Bars/Steps* Stainless Steel * Low Profile * 5 Inch X 80 Inch* No Drilling Required* Cab Length* Sold Individually*...
    650080PS
    SKU:
    650080PS
    Truck Class:
    Light Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Finish Options:
    Polished
    Product Type:
    Frame & Chassis
    $478.12
    Qty in Cart: 0
    Price:
    $478.12
    Subtotal:
  • Go Rhino 6 X 80 Inch Xtreme Low Profile Black Textured Steel Side Bars/ Steps

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

    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 80 Inch * No Drilling Required* Cab...
    660080T
    SKU:
    660080T
    Truck Class:
    Light Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Color:
    Black
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $528.94
    Qty in Cart: 0
    Price:
    $528.94
    Subtotal:
  • Go Rhino 48 Inch Textured Black Galvanized Steel Running Board Side Step

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

    GO RHINO

    $361.99
    Black Textured 48 Inch Running Board Side Step* High Quality Running Boards-Side Steps* Replacement Running Boards Only, Brackets Not Included* Galvanized Steel* Textured Black Coating* 48 Inch Long...
    630048PC
    SKU:
    630048PC
    Truck Class:
    Light Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Color:
    Black
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $361.99
    Qty in Cart: 0
    Price:
    $361.99
    Subtotal:
  • Go Rhino 5 X 80 Inch Xtreme Low Profile Black Textured Steel Side Bars/ Steps

    Go Rhino 5 X 80 Inch Xtreme Low Profile Black Textured Steel Side Bars/ Steps

    GO RHINO

    $418.06
    Universal Extreme Low Profile Black Textured Steel Side Bars & Steps* High Quality Side Bars/Steps* Galvanized Steel * Textured Black * Low Profile * 5 Inch X 80 Inch* No Drilling Required* Cab...
    650080T
    SKU:
    650080T
    Truck Class:
    Light Duty
    Make:
    Universal Items
    Material Options:
    Steel
    Color:
    Black
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $418.06
    Qty in Cart: 0
    Price:
    $418.06
    Subtotal:
  • BESTfit Square U Bolt Kit- 3/4 x 4 x 10 Inch

    BESTfit Square U Bolt Kit- 3/4 x 4 x 10 Inch

    BESTFIT TRUCK PARTS

    $26.53
    3/4 x 4 x 10 Inch Square Bend Top U-Bolt Kit By BESTfitSecure your truck's suspension and axle components with the BESTfit Square U-Bolt Kit, 3/4 x 4 x 10 Inch. This high-quality kit includes two...
    29-0509010
    SKU:
    29-0509010
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Height Options:
    10 Inch
    $26.53
    Qty in Cart: 0
    Price:
    $26.53
    Subtotal:
  • On Sale
    Limited Quantity Available
    Monroe Magnum Shock Absorber For Drive Axle Suspension W/ Flex Air & AG380 Suspension

    Monroe Magnum Shock Absorber For Drive Axle Suspension W/ Flex Air & AG380 Suspension

    OPP - ORIGINAL PARTS PROGRAM

    Now: $25.67
    Was: $97.60
    Yellow Monroe Magnum Shock Absorber Fits Drive Axle Suspension W/ Flex AirChoose a reliable suspension replacement with this Monroe Magnum Shock Absorber for drive axle suspension. Made with a...
    29-050006
    SKU:
    29-050006
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Ready To Ship:
    Yes
    Diameter Options:
    5/8 Inch
    Color:
    Yellow
    Length Options:
    30 1/2 Inch
    Product Type:
    Frame & Chassis
    Now: $25.67
    Was: $97.60
    Qty in Cart: 0
    Price:
    Now: $25.67
    Was: $97.60
    Subtotal:
  • JOST Air Release Fifth Wheel Top Plate

    JOST Air Release Fifth Wheel Top Plate

    OPP - ORIGINAL PARTS PROGRAM

    $3,335.99
    Jost Fifth Wheel Top Plate - Low LubeTired of the hassle of lubricating your fifth wheel? Check out the JOST Greaseless 5th Wheel Top Plate. This top plate reduces maintenance time and keeps your...
    09-05110264
    SKU:
    09-05110264
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $3,335.99
    Qty in Cart: 0
    Price:
    $3,335.99
    Subtotal:
  • 5th Wheel Assembly W/ 24 Inch Travel Base BLH7AWB975024

    5th Wheel Assembly W/ 24 Inch Travel Base BLH7AWB975024

    OPP - ORIGINAL PARTS PROGRAM

    $5,750.99
    5th Wheel Assembly W/ 9-3/4 Inch Legs And 24 Inch Travel Base* High Quality Wheel Assembly * With 9.75 Inch Legs * 24 Inch Travel Base* Made In USA* Sold Individually* Warranty On Wheel Assembly...
    09-05110251
    SKU:
    09-05110251
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $5,750.99
    Qty in Cart: 0
    Price:
    $5,750.99
    Subtotal:
  • Holland 9 Inch Riser W/ FW35 Holland And Mounting Kit

    Holland 9 Inch Riser W/ FW35 Holland And Mounting Kit

    OPP - ORIGINAL PARTS PROGRAM

    $5,082.99
    9 Inch Riser With FW35 Holland 5th Wheel* High Quality Riser* 9 Inch* With Mounting Kit* With Fw35 Holland 5Th Wheel* Made In USA* Sold Individually* Warranty On Risers Against Defects In Workmanship...
    09-05110238
    SKU:
    09-05110238
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $5,082.99
    Qty in Cart: 0
    Price:
    $5,082.99
    Subtotal:
  • Black Forged Steel Receiver Mount Tow Eye For 2 Inch Receiver Tube

    Black Forged Steel Receiver Mount Tow Eye For 2 Inch Receiver Tube

    BUYERS PRODUCTS

    $43.12
    Receiver Mount Tow Eye* High Quality Receiver Mount Tow Eye* Forged Steel* Black Powder-Coated Finish* Handles Straight-Line Towing Up To 12000 Lb.* The Eye Fits Into Any Front Or Rear Mounted 2 Inch...
    09-051100917
    SKU:
    09-051100917
    Rating:
    12000 LBS
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $43.12
    Qty in Cart: 0
    Price:
    $43.12
    Subtotal:
  • FREE SHIPPING OVER $249
    Road Armor Steel 7/8 Inch Classic Shackle

    Road Armor Steel 7/8 Inch Classic Shackle

    ROAD ARMOR

    $184.99
    Textured Black Finish Steel Classic Shackle* High Quality Shackle* Steel* Textured Black Powder Coated Finish* Are Some Of The Toughest Hooks On The Market* Made In USA* Sold Individually* Warranty...
    09-051100903
    SKU:
    09-051100903
    Truck Class:
    Light Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $184.99
    Qty in Cart: 0
    Price:
    $184.99
    Subtotal:
  • 5th Wheel Assembly With 9 Inch Legs & 36 Inch Outboard Slide Replaces FW35, A936XL00

    5th Wheel Assembly With 9 Inch Legs & 36 Inch Outboard Slide Replaces FW35, A936XL00

    OPP - ORIGINAL PARTS PROGRAM

    $4,186.99
    5Th Wheel Assembly W/ 9 Inch LegsBring superior hauling power to your truck with this heavy-duty 5th Wheel Assembly. Featuring 9-inch legs and a 36-inch outboard slide, it's made in the USA for...
    09-05110250
    SKU:
    09-05110250
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $4,186.99
    Qty in Cart: 0
    Price:
    $4,186.99
    Subtotal:
  • 10 Safety Chain Hanger - MGTW 90,000 Lbs

    10 Safety Chain Hanger - MGTW 90,000 Lbs

    PREMIER

    $188.99
    Safety Chain Hanger* High Quality Safety Chain Hanger* 9-3/16 Inch Overall Length * 5-1/2 Inch Width* 3-5/16 Inch Height* 3-1/16 Inch Diameter * MGTW 90000 Lbs* Made In USA* Sold Individually*...
    09-051100899
    SKU:
    09-051100899
    Truck Class:
    Universal
    Rating:
    90000 LBS
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $188.99
    Qty in Cart: 0
    Price:
    $188.99
    Subtotal:
  • Holland Fifth Wheel Handle Release Lever RK071511

    Holland Fifth Wheel Handle Release Lever RK071511

    OPP - ORIGINAL PARTS PROGRAM

    $128.99
    Handle Release LeverThe Holland Fifth Wheel Handle Release Lever makes connecting and disconnecting semi-trailers a breeze. Its durable design and smooth operation ensure a secure connection,...
    09-05110260
    SKU:
    09-05110260
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $128.99
    Qty in Cart: 0
    Price:
    $128.99
    Subtotal:
  • FREE SHIPPING OVER $249
    271 Thimble Pushrod, 7/8 X 2 1/8 Inch

    271 Thimble Pushrod, 7/8 X 2 1/8 Inch

    PREMIER

    $30.27
    Thimble Pushrod* High Quality Thimble Pushrod* 7/8 Inch X 2-1/8 Inch Length* Used On The End Of The Pushrod Of An Air Chamber That Contacts The Slack Adjustment Shoe In Air Take Up Couplings* Made In...
    09-051100879
    SKU:
    09-051100879
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $30.27
    Qty in Cart: 0
    Price:
    $30.27
    Subtotal:
  • FREE SHIPPING OVER $249
    271 Standard Thimble Pushrod, 7/8 X 3/4 Inch

    271 Standard Thimble Pushrod, 7/8 X 3/4 Inch

    PREMIER

    $21.31
    Standard Thimble Pushrod* High Quality Standard Thimble Pushrod* 7/8 Inch X 2-3/4 Inch Length* Used On The End Of The Pushrod Of An Air Chamber That Contacts The Slack Adjustment Shoe In Air Take Up...
    09-051100875
    SKU:
    09-051100875
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $21.31
    Qty in Cart: 0
    Price:
    $21.31
    Subtotal:
  • Steel Receiver Mounted Tow Hook For 2 Inch Receiver Tube

    Steel Receiver Mounted Tow Hook For 2 Inch Receiver Tube

    BUYERS PRODUCTS

    $29.14
    RM10H Tow Hook* High Quality Receiver Mounted Tow Hook* Carbon Steel* Black Powder-Coated Finish* Handles Recovery Towing And Is Rated To 10000 Lb. * Fits Into Any Front Or Rear Mounted 2 Inch...
    09-051100916
    SKU:
    09-051100916
    Truck Class:
    Universal
    Rating:
    10000 LBS
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $29.14
    Qty in Cart: 0
    Price:
    $29.14
    Subtotal:
  • 267F Non Standard Air Chamber Bracket, 4 5/8 Inch For 270, 2200 Saf-Tite 100 And 820 Slack Reducing Couplings

    267F Non Standard Air Chamber Bracket, 4 5/8 Inch For 270, 2200 Saf-Tite 100 And 820 Slack Reducing Couplings

    PREMIER

    $118.99
    Non- Standard Air Chamber Bracket* High Quality Non- Standard Air Chamber Bracket* 4-5/8 Inch Overall Length* For Use With 270/2200 Saf-Tite 100 And 820 Slack Reducing Couplings* Made In USA* Sold...
    09-051100871
    SKU:
    09-051100871
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $118.99
    Qty in Cart: 0
    Price:
    $118.99
    Subtotal:
  • Holland 5th Wheel Bracket Pin And Bushing Kit

    Holland 5th Wheel Bracket Pin And Bushing Kit

    OPP - ORIGINAL PARTS PROGRAM

    $99.99
    Replacement Bracket Cushion And Pin Kit RK10605* High Quality Bracket Pin And Bushing Kit* Sold Individually* Warranty On Bracket Pin And Bushing Kits Against Defects In Workmanship & Material From...
    09-05110224
    SKU:
    09-05110224
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $99.99
    Qty in Cart: 0
    Price:
    $99.99
    Subtotal:
  • Type 30 Air Chamber W/ 8 Inch Pushrod

    Type 30 Air Chamber W/ 8 Inch Pushrod

    PREMIER

    $149.99
    Type 30 Air Chamber For Pintle Hook & Drawbar Eye Applications* High Quality Air Chamber* 8 Inch Pushrod* Type 30 * Maximum Force At 100 PSI / 3000 Lbs* For Pintle Hook And Drawbar Eye Applications*...
    09-051100867
    SKU:
    09-051100867
    Truck Class:
    Universal
    Length Options:
    8 Inch
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $149.99
    Qty in Cart: 0
    Price:
    $149.99
    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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