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Peterbilt 388 Frame Crossmembers & Covers

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  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Grease Fitting 1/8in 27 NPT - Straight

    Grease Fitting 1/8in 27 NPT - Straight

    AUTOMANN USA

    $0.45
    1/8 Inch 27 NPT Straight 5/8 Inch Long Grease Zerk Fitting* High Quality Grease Fitting* 5/8 Inch Length* Thread: 1/8 Inch- 27 NPT * Sold Individually* Warranty On Grease Fittings Against Defects In...
    09-059904
    SKU:
    09-059904
    Truck Class:
    Universal
    Material Options:
    Bronze
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $0.45
    Qty in Cart: 0
    Price:
    $0.45
    Subtotal:
  • On Sale
    Limited Quantity Available
    Flanged Lock Nut 1/2 Inch- 20 TPI

    Flanged Lock Nut 1/2 Inch- 20 TPI

    AUTOMANN USA

    Now: $0.18
    Was: $0.94
    Flanged Lock Nut Replaces 8397200, 10048004, W300305, 231102008, 23-1102008, And 414087C1* High Quality Flanged Lock Nut* 0.50 Inch Height* 0.750 Inch A/F* Threads: 1/2 Inch- 20 TPI* Sold...
    09-05250031
    SKU:
    09-05250031
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Now: $0.18
    Was: $0.94
    Qty in Cart: 0
    Price:
    Now: $0.18
    Was: $0.94
    Subtotal:
  • Torque Rod Bolt Kit 5/8 Inch - Sa2206

    Torque Rod Bolt Kit 5/8 Inch - Sa2206

    AUTOMANN USA

    $6.92
    Torque Rod Bolt Kit Replaces SA2206* High Quality Torque Rod Bolt Kit * Consists Of  - (1) Shackle Bolt - (1) U Bolt Washer 5/8 Inch  - (1) Lock Nut 5/8 Inch* Sold Individually* Warranty On Torque...
    09-05250056
    SKU:
    09-05250056
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $6.92
    Qty in Cart: 0
    Price:
    $6.92
    Subtotal:
  • Poly Fifth Wheel Bushing Kit Replaces E-9569, RL04413 For SAF Holland/Neway

    Poly Fifth Wheel Bushing Kit Replaces E-9569, RL04413 For SAF Holland/Neway

    AFTERMARKET

    $87.99
    Holland 5th Wheel Poly Bushing KitKeep your SAF Holland or Neway fifth wheel running smoothly with this Poly Fifth Wheel Bushing Kit, replacing OEM parts E-9569 and RL04413. This complete kit...
    09-05110025
    SKU:
    09-05110025
    Truck Class:
    Universal
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $87.99
    Qty in Cart: 0
    Price:
    $87.99
    Subtotal:
  • Flanged Lock 5/8 In -18 TPI

    Flanged Lock 5/8 In -18 TPI

    AUTOMANN USA

    $1.21
    Flanged Lock Nut Replaces 10008001, 414089C1, R303793Achieve reliable, vibration-resistant connections with the Flanged Lock 5/8 In -18 TPI. Built for truck applications, this flanged lock nut...
    09-05250030
    SKU:
    09-05250030
    Material Options:
    Steel
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $1.21
    Qty in Cart: 0
    Price:
    $1.21
    Subtotal:
  • Poly Fifth Wheel Bushing 2.8 OD X 2 ID X 4 Inch - SK290594, SK290595 For Jost

    Poly Fifth Wheel Bushing 2.8 OD X 2 ID X 4 Inch - SK290594, SK290595 For Jost

    AUTOMANN USA

    $17.34
    Jost Fifth Wheel Polly Bushing Replaces SK290594 And SK290595* High Quality Fifth Wheel Bushing* Poly* Dimensions: - 4.00 Inch Length - 2.80 Inch OD - 2.00 Inch ID* Sold Individually* Warranty On...
    09-05110024
    SKU:
    09-05110024
    Material Options:
    Plastic/Poly
    Truck Class:
    Universal
    Length Options:
    4 Inch
    Diameter Options:
    2 Inch
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $17.34
    Qty in Cart: 0
    Price:
    $17.34
    Subtotal:
  • Lock Nut 3/4 Inch-16 Grade C

    Lock Nut 3/4 Inch-16 Grade C

    AUTOMANN USA

    $1.80
    Grade C 3/4 Inch-16 Lock Nut* High Quality Lock Nut* 1.106 Inch A/F* 0.63 Inch Height* Thread: 3/4 Inch-16* Sold Individually* Warranty On Lock Nuts Against Defects In Workmanship & Material From...
    09-05250047
    SKU:
    09-05250047
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $1.80
    Qty in Cart: 0
    Price:
    $1.80
    Subtotal:
  • Jam Nut 3/8 Inch-16 TPI

    Jam Nut 3/8 Inch-16 TPI

    AUTOMANN USA

    $0.19
    7/32 Inch Thick Jam Nut* High Quality Jam Nut* W.A.F.- 9/16 Inch* Thickness 7/32 Inch * Threads: 3/8 Inch- 16* Sold Individually* Warranty On Jam Nuts Against Defects In Workmanship & Material From...
    09-05250027
    SKU:
    09-05250027
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $0.19
    Qty in Cart: 0
    Price:
    $0.19
    Subtotal:
  • Cross Tube 2.5 OD X 53 Inch - 3453311

    Cross Tube 2.5 OD X 53 Inch - 3453311

    AFTERMARKET

    $501.99
    53 Inch Cross Tube Replaces 3453311* High Quality Cross Tube* Dimensions: - 2.50 Inch OD  - 53.0 Inch Overall Length* Driver Side* End 1-1/4 Inch-12 Right Hand Thread * End 2-5/8 Inch-12 Left Hand...
    09-05090024
    SKU:
    09-05090024
    Material Options:
    Steel
    Length Options:
    53 Inch
    Diameter Options:
    2 1/2 Inch
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $501.99
    Qty in Cart: 0
    Price:
    $501.99
    Subtotal:
  • T- Rod Mount Bracket 4.375 Inch, Offset - 307182 For Peterbilt

    T- Rod Mount Bracket 4.375 Inch, Offset - 307182 For Peterbilt

    AFTERMARKET

    $220.99
    Peterbilt 4.375 Inch C To C Mount To Axle HousingUpgrade your heavy-duty truck steering system with the T Rod Mount Bracket 4.375 Inch Offset, engineered for durability and precise fitment. This...
    01-05100028
    SKU:
    01-05100028
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    $220.99
    Qty in Cart: 0
    Price:
    $220.99
    Subtotal:
  • Torque Rod Bracket 4.375 Replaces D2Hz5883A For Peterbilt

    Torque Rod Bracket 4.375 Replaces D2Hz5883A For Peterbilt

    AUTOMANN USA

    $32.60
    T Rod Bracket With 0.812 Inch Holes At 4.375 Inch Replaces D2HZ5883AUpgrade your truck suspension with the 4.375-inch Torque Rod Bracket, part number D2HZ5883A, designed to offer superior support and...
    01-05100024
    SKU:
    01-05100024
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    $32.60
    Qty in Cart: 0
    Price:
    $32.60
    Subtotal:
  • T- Rod Bracket 4 3/8 Inch- 308382 For Peterbilt Air Trac

    T- Rod Bracket 4 3/8 Inch- 308382 For Peterbilt Air Trac

    AFTERMARKET

    $155.99
    Mount to Axle Housing With 5/8in Holes At 4-3/8in C to CThe 4 3/8 Inch T Rod Bracket offers rugged durability and dependable performance for heavy-duty truck suspension setups. Engineered for easy...
    01-05100026
    SKU:
    01-05100026
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    $155.99
    Qty in Cart: 0
    Price:
    $155.99
    Subtotal:
  • Front of Rear Leaf Spring Hanger 8 Inch For Air Trac Peterbilt

    Front of Rear Leaf Spring Hanger 8 Inch For Air Trac Peterbilt

    AFTERMARKET

    $547.99
    Front Of Rear 8 Inch Leaf Spring Hanger W/ 3/4 Inch FlangeThe 8-inch Leaf Spring Hanger for the front of the rear spring is an essential suspension component designed to provide secure mounting and...
    01-05100025
    SKU:
    01-05100025
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    $547.99
    Qty in Cart: 0
    Price:
    $547.99
    Subtotal:
  • Spring Eye Bracket 6 Inch - 300421 For Peterbilt - 3.5 Inch Spring

    Spring Eye Bracket 6 Inch - 300421 For Peterbilt - 3.5 Inch Spring

    AFTERMARKET

    $211.99
    6 Inch Peterbilt Spring Eye Bracket for 3.5 Inch Wide Spring Replaces 300421The Spring Eye Bracket 6 Inch 300421 offers a robust solution for mounting leaf springs on heavy trucks. Engineered to...
    01-05100017
    SKU:
    01-05100017
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    Length Options:
    6 Inch
    Width Options:
    3 1/2 Inch
    $211.99
    Qty in Cart: 0
    Price:
    $211.99
    Subtotal:
  • Leaf Spring Wear Pad 4.25 Inch - 306219 For Peterbilt Rear Air Trac

    Leaf Spring Wear Pad 4.25 Inch - 306219 For Peterbilt Rear Air Trac

    AFTERMARKET

    $131.99
    2.5 Inch C To C Leaf Spring Wear Pad Replaces 03-06219Ensure long-lasting suspension reliability with the Leaf Spring Wear Pad 4.25 Inch, engineered to minimize wear and tear on leaf springs. This...
    01-05100020
    SKU:
    01-05100020
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • BESTFit Center Bolt 1/2 In-20 Thread - 7/16 Inch Head

    BESTFit Center Bolt 1/2 In-20 Thread - 7/16 Inch Head

    BESTFIT TRUCK PARTS

    $3.45 - $42.03
    Secure your suspension and maintain precise alignment with the BESTFit Center Bolt 1/2 In-20 Thread - 7/16 Inch Head, available in multiple lengths including 4-inch, 8-inch, 10-inch, and 12-inch...
    PPR_206116
    SKU:
    PPR_206116
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Length Options:
    10 Inch
    Ready To Ship:
    Yes
    $3.45 - $42.03
    Qty in Cart: 0
    Price:
    $3.45 - $42.03
    Subtotal:
  • Brake Shoe Rivets W/ 0.5 Inch Head

    Brake Shoe Rivets W/ 0.5 Inch Head

    AUTOMANN USA

    $76.99 - $199.99
    Choose Option(s) to see description.0.563 Inch Steel Brake Shoe Rivets - RV3109SSteel Brake Lining Shoe Rivets Replaces OE RV3109S* High Quality Brake Shoe Rivet* Steel* Dimensions: - 0.563 Inch...
    PPR_206134
    SKU:
    PPR_206134
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $76.99 - $199.99
    Qty in Cart: 0
    Price:
    $76.99 - $199.99
    Subtotal:
  • Hex Head Flange Bolts - Grade 8 For Peterbilt

    Hex Head Flange Bolts - Grade 8 For Peterbilt

    AUTOMANN USA

    $2.30 - $5.77
    Keep your Peterbilt secure and road-ready with these Grade 8 Hex Head Flange Bolts. Available in a variety of sizes-including 3/4-10 x 2-1/2", 3/4-10 x 2-1/4", 5/8-11 x 2-1/4", 3/4-10 x 2-3/4",...
    PPR_206033
    SKU:
    PPR_206033
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    $2.30 - $5.77
    Qty in Cart: 0
    Price:
    $2.30 - $5.77
    Subtotal:
  • 3/16 Cotter Pin

    3/16 Cotter Pin

    AUTOMANN USA

    $0.44 - $1.13
    Choose Option(s) to see description.Cotter Pin 3/16 X 3 Inch - 17800001 For HendricksonCotter Pin 3/16 X 3 Inch Replaces 17800001* High Quality Cotter Pin* 3/16 Inch X 3 Inch* Sold Individually*...
    PPR_206095
    SKU:
    PPR_206095
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $0.44 - $1.13
    Qty in Cart: 0
    Price:
    $0.44 - $1.13
    Subtotal:
  • Spring Equalizer Hex Bolt 1.0in -14 x 6-1/2 Inch Grade 8 For Chevrolet, GM

    Spring Equalizer Hex Bolt 1.0in -14 x 6-1/2 Inch Grade 8 For Chevrolet, GM

    AUTOMANN USA

    $12.71
    Grade 8 Hex Spring Bolt W/ Fine Pitch Replaces FSP00503028, 3822130, 70002002, And ST1004* High Quality Spring Bolt * Dimensions: - 1 Inch Bolt Diameter - 6-1/2 Inch Bolt Length* Bolt Type- Hex...
    29-05250014
    SKU:
    29-05250014
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $12.71
    Qty in Cart: 0
    Price:
    $12.71
    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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