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Peterbilt 379 Frame Crossmembers & Covers

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  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • CSM 34 Inch Wide Diamond Plate Aluminum Deck Plates

    CSM 34 Inch Wide Diamond Plate Aluminum Deck Plates

    CHROME SHOP MAFIA

    $181.99 - $819.99
    Add dependable footing and bold styling to your truck with the CSM 34 Inch Wide Diamond Plate Aluminum Deck Plate. Built from durable aluminum with a raised diamond tread pattern, it provides...
    PPR_202161
    SKU:
    PPR_202161
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Aluminum
    Make:
    Universal Items
    Finish Options:
    Diamond Plate
    Style Options:
    Surface Mount
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Width Options:
    34 Inch
    Length Options:
    48 Inch
    $181.99 - $819.99
    Qty in Cart: 0
    Price:
    $181.99 - $819.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Horn Block Off Plate By CSM For Peterbilt

    Horn Block Off Plate By CSM For Peterbilt

    CHROME SHOP MAFIA

    $15.70
    Horn Block Off Plates For Peterbilt By Chrome Shop MafiaThis Peterbilt horn block off plate covers the horn opening when you're installing a different horn or relocating the original one, keeping...
    01-091314
    SKU:
    01-091314
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Peterbilt
    Product Type:
    Exterior
    Ready To Ship:
    Yes
    $15.70
    Qty in Cart: 0
    Price:
    $15.70
    Subtotal:
  • Merritt 30.25 Inch Aluminum Flush Mount Dyna Deck Plate

    Merritt 30.25 Inch Aluminum Flush Mount Dyna Deck Plate

    MERRITT

    $227.99 - $753.99
    Upgrade your truck bed or trailer with the Merritt 30.25 Inch Aluminum Flush Mount Dyna Deck Plate. Available in multiple sizes-18.5 x 30.25, 28 x 30.25, 37.5 x 30.25, 56 x 30.25, and 65.25 x 30.25...
    PPR_201926
    SKU:
    PPR_201926
    Location:
    Made In USA
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Style Options:
    Flush Mount
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    Length Options:
    46 Inch
    Ready To Ship:
    Yes
    Length Options:
    56 Inch
    Length Options:
    18 1/2 Inch
    Length Options:
    28 Inch
    Length Options:
    65 Inch
    Width Options:
    30 Inch
    Length Options:
    37 1/2 Inch
    Type Options:
    Flush Mount
    Length Options:
    74 Inch
    $227.99 - $753.99
    Qty in Cart: 0
    Price:
    $227.99 - $753.99
    Subtotal:
  • FREE SHIPPING
    Train Horn Black Heavy Duty 3 Bell Stacked by BESTfit

    Train Horn Black Heavy Duty 3 Bell Stacked by BESTfit

    BESTFIT TRUCK PARTS

    $736.99
    BESTfit Powder Coated Triple Trumpet Train HornThis Three Bell Heavy Duty Train Horn boasts durable aluminum construction that packs a serious punch. It's ready to blast loud noise with ease, but...
    09-0513130
    SKU:
    09-0513130
    Truck Class:
    Universal
    Color:
    Black
    Style Options:
    3 Bell
    Material Options:
    Aluminum
    Make:
    Universal Items
    Shape Options:
    Round
    Product Type:
    Frame & Chassis
    Length Options:
    15 1/2 Inch
    Finish Options:
    Black Powder Coat
    Ready To Ship:
    Yes
    $736.99
    Qty in Cart: 0
    Price:
    $736.99
    Subtotal:
  • 5th Wheel Height Slider Bracket W/ Bushings For Holland 5th Wheels

    5th Wheel Height Slider Bracket W/ Bushings For Holland 5th Wheels

    OPP - ORIGINAL PARTS PROGRAM

    $629.99 - $934.99
    Optimize your setup with the 5th wheel height slider bracket with bushings for Holland 5th wheels. Built as a precision-engineered aftermarket replacement, this bracket system is intended for use...
    PPR_203422
    SKU:
    PPR_203422
    Color:
    Black
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $629.99 - $934.99
    Qty in Cart: 0
    Price:
    $629.99 - $934.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Chrome 3 Trumpet Competition Series Train Horn W/ 150 db +- 10db Sound Output

    Chrome 3 Trumpet Competition Series Train Horn W/ 150 db +- 10db Sound Output

    UNITED PACIFIC

    $139.99
    Chrome 3 Trumpet Train HornAre you looking to add a powerful horn to your truck? 4 State Trucks offers this great sounding 3 trumpet chrome-plated train horn from the Competition Series. It comes...
    09-051355
    SKU:
    09-051355
    Truck Class:
    Universal
    Style Options:
    3 Bell
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Shape Options:
    Round
    Material Options:
    Zinc
    Product Type:
    Frame & Chassis
    Length Options:
    15 1/2 Inch
    Height Options:
    11 1/2 Inch
    Width Options:
    11 3/4 Inch
    Ready To Ship:
    Yes
    $139.99
    Qty in Cart: 0
    Price:
    $139.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Hadley Chrome Air Horn Mount Kit W/ Front Horn Support & Hardware

    Hadley Chrome Air Horn Mount Kit W/ Front Horn Support & Hardware

    HADLEY

    $10.38
    Hadley Chrome Air Horn Mount Kit W/ Hardware For Single Rectangular & Round Bell Horns W/3 Hole Pattern.The Hadley Horn Mounting Kit features a chrome front horn support designed to accommodate...
    09-051330
    SKU:
    09-051330
    Truck Class:
    Universal
    Make:
    Universal Items
    Position:
    Kit Full
    Height Options:
    3 1/2 Inch
    Type Options:
    Front Mount
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $10.38
    Qty in Cart: 0
    Price:
    $10.38
    Subtotal:
  • FREE SHIPPING
    3 Trumpet Chrome Train Horn With 9 Inch Air Valve Stand

    3 Trumpet Chrome Train Horn With 9 Inch Air Valve Stand

    UNITED PACIFIC

    $289.99
    Chrome Plated 3 Trumpet Train Horn With Air Valve Stand* High Quality Train Horn* Sound Output Is Approximately 150db +- 10db* 150 PSI Maximum Air Pressure* Includes:  - (3) Trumpets, Zinc Alloy With...
    09-051353
    SKU:
    09-051353
    Truck Class:
    Universal
    Style Options:
    3 Bell
    Material Options:
    Steel
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Shape Options:
    Round
    Ready To Ship:
    Yes
    Product Type:
    Frame & Chassis
    $289.99
    Qty in Cart: 0
    Price:
    $289.99
    Subtotal:
  • Merritt Aluminum Dyna Deck Top Mount Deck Plate 33.25 Inch Wide W/ Height Options

    Merritt Aluminum Dyna Deck Top Mount Deck Plate 33.25 Inch Wide W/ Height Options

    MERRITT

    $221.99 - $644.99
    For truck owners seeking strength, style, and utility, the Merritt 33.25 Inch Wide Aluminum Dyna Deck Top Mount Deck Plate delivers unmatched performance. Made from premium aluminum, it provides a...
    PPR_201929
    SKU:
    PPR_201929
    Truck Class:
    Universal
    Location:
    Made In USA
    Material Options:
    Aluminum
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Length Options:
    28 Inch
    Width Options:
    33 Inch
    Length Options:
    47 Inch
    Length Options:
    18 1/2 Inch
    Length Options:
    65 Inch
    Length Options:
    37 1/2 Inch
    Position:
    Kit Full
    Type Options:
    Top Mount
    Style Options:
    Ribbed
    $221.99 - $644.99
    Qty in Cart: 0
    Price:
    $221.99 - $644.99
    Subtotal:
  • FREE SHIPPING OVER $249
    15/16 Or 7/8 Inch Chrome Nut Cover Top Hat Style

    15/16 Or 7/8 Inch Chrome Nut Cover Top Hat Style

    LIFETIME NUT COVERS

    $2.54
    Chrome Top Hat Nut Cover With FlangeLifetime nut covers are made with drivers in mind. This short top hat nut cover with a flange is for 15/16 inch and ? inch bolt heads. Made of ABS plastic injected...
    09-0506108
    SKU:
    09-0506108
    Truck Class:
    Universal
    Location:
    Made In USA
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $2.54
    Qty in Cart: 0
    Price:
    $2.54
    Subtotal:
  • FREE SHIPPING
    Steering Stabilizer Kit

    Steering Stabilizer Kit

    TWELVE GAUGE

    $301.99
    12 Gauge Replacement Shock Absorber / Stabilizer Steering KitUpgrade with this Steering Stabilizer Kit for a smoother, more stable ride. Experience the immediate difference as you navigate rough...
    09-050902
    SKU:
    09-050902
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Length Options:
    26 Inch
    Position:
    Kit Full
    Make:
    Dodge
    $301.99
    Qty in Cart: 0
    Price:
    $301.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit Stainless Steel Air Tank U-Bolt Replaces K241-576 & G34-6006 For Kenworth & Peterbilt W/ 10 Inch Diameter Tank

    BESTfit Stainless Steel Air Tank U-Bolt Replaces K241-576 & G34-6006 For Kenworth & Peterbilt W/ 10 Inch Diameter Tank

    BESTFIT TRUCK PARTS

    $18.35
    PACCAR Air Tank U-Bolt By BESTfitSecure your Kenworth or Peterbilt 10-inch diameter air tank with the BESTfit Stainless Steel Air Tank U-Bolt, designed as a high-quality replacement for K241-576 and...
    29-051401
    SKU:
    29-051401
    Length Options:
    10 Inch
    Truck Class:
    Heavy Duty
    Height Options:
    11 Inch
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $18.35
    Qty in Cart: 0
    Price:
    $18.35
    Subtotal:
  • Cab Air Ride Suspension Kit With Upper & Lower Brackets, Shocks, Air Bag, Air Valve & Torque Rod By BESTfit For Peterbilt

    Cab Air Ride Suspension Kit With Upper & Lower Brackets, Shocks, Air Bag, Air Valve & Torque Rod By BESTfit For Peterbilt

    BESTFIT TRUCK PARTS

    $1,799.99
    BESTfit Peterbilt Cab Air Ride KitThe Peterbilt cab air ride with upper and lower bracket features two shocks, one air bag, one air valve, and one torque rod. It is designed to fit models 359, 379,...
    01-091318
    SKU:
    01-091318
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Exterior
    Position:
    Kit Full
    $1,799.99
    Qty in Cart: 0
    Price:
    $1,799.99
    Subtotal:
  • FREE SHIPPING
    CSM Stainless Steel Surface-Mount Air Line Box

    CSM Stainless Steel Surface-Mount Air Line Box

    CHROME SHOP MAFIA

    $320.99 - $401.99
    Revamp your rig with the CSM Stainless Steel Surface Mount Air Line Box, an essential component for truck owners seeking to streamline their air line and electrical connections. Made from durable 304...
    PPR_202176
    SKU:
    PPR_202176
    Length Options:
    32 Inch
    Truck Class:
    Universal
    Location:
    Made In USA
    Style Options:
    Surface Mount
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Ready To Ship:
    Yes
    Product Type:
    Air, Electrical, & Safety
    $320.99 - $401.99
    Qty in Cart: 0
    Price:
    $320.99 - $401.99
    Subtotal:
  • FREE SHIPPING
    12 Gauge Customs Replacement Solenoid For Kenworth & Peterbilt Gen III Air Ride Kits

    12 Gauge Customs Replacement Solenoid For Kenworth & Peterbilt Gen III Air Ride Kits

    TWELVE GAUGE

    $275.99
    Replacement Solenoid By 12 Gauge Customs Fits Kenworth & Peterbilt Gen III Air Ride KitsIf your solenoid for your Gen III ride kit is showing wear or damage, 4 State Trucks has a quality Air-Electric...
    29-050936
    SKU:
    29-050936
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $275.99
    Qty in Cart: 0
    Price:
    $275.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Limited Quantity Available
    Chrome Plastic Flat Top Nut Covers, Push On

    Chrome Plastic Flat Top Nut Covers, Push On

    UNITED PACIFIC

    $0.86 - $87.99
    Give your wheels a clean, finished appearance with these Chrome Plastic Flat Top Nut Covers. Designed for hex nuts and bolts, these push-on nut covers feature a chrome-plated plastic construction...
    PPR_204327
    SKU:
    PPR_204327
    Truck Class:
    Universal
    Style Options:
    Flat
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Truck Class:
    Heavy Duty
    Ready To Ship:
    Yes
    Product Type:
    Frame & Chassis
    $0.86 - $87.99
    Qty in Cart: 0
    Price:
    $0.86 - $87.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit Cab-Sleeper Air Spring Replaces SC29Y036, 7036 & 7066 For Peterbilt

    BESTfit Cab-Sleeper Air Spring Replaces SC29Y036, 7036 & 7066 For Peterbilt

    BESTFIT TRUCK PARTS

    $46.90
    Cab-Sleeper Air Spring Fits Peterbilt* High Quality Air Spring* Sleeve Type* Bumper: No* 874 Lb Load At 80 PSI* 1094 Lb Load At 100 PSI* 110 CPM Natural Frequency* Top Plate:  - (1) Hole/Stud  - 2.99...
    01-0950001
    SKU:
    01-0950001
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Exterior
    Ready To Ship:
    Yes
    $46.90
    Qty in Cart: 0
    Price:
    $46.90
    Subtotal:
  • On Sale
    Limited Quantity Available
    Stainless Steel In-Frame Deck Plate For Trucks W/ 27 Inches Between Frame Rails

    Stainless Steel In-Frame Deck Plate For Trucks W/ 27 Inches Between Frame Rails

    IOWA CUSTOMS

    $398.69 - $855.89
    Optimize your setup with the Stainless Steel Flush Mount In-Frame Deck Plate, a stellar upgrade for truck owners looking for both functionality and style. Made from #8 304 polished stainless steel,...
    PPR_202165
    SKU:
    PPR_202165
    Truck Class:
    Universal
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Length Options:
    36 Inch
    Length Options:
    84 Inch
    Type Options:
    Flush Mount
    Length Options:
    60 Inch
    Finish Options:
    Polished
    Location:
    Made In USA
    Length Options:
    72 Inch
    Style Options:
    In Frame
    Width Options:
    27 Inch
    Length Options:
    48 Inch
    Length Options:
    96 Inch
    $398.69 - $855.89
    Qty in Cart: 0
    Price:
    $398.69 - $855.89
    Subtotal:
  • FREE SHIPPING
    CSM Stainless Steel Trough Style Flush-Mount Air Line Box

    CSM Stainless Steel Trough Style Flush-Mount Air Line Box

    CHROME SHOP MAFIA

    $303.99 - $337.99
    The Stainless Steel Trough Style Flush Mount Air Line Box is a must-have to organize air lines and electrical connections efficiently. Constructed from durable 304 stainless steel, this air line box...
    PPR_202175
    SKU:
    PPR_202175
    Truck Class:
    Universal
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Style Options:
    Flush Mount
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $303.99 - $337.99
    Qty in Cart: 0
    Price:
    $303.99 - $337.99
    Subtotal:
  • FREE SHIPPING
    BESTfit Polished Aluminum Air Tank For Peterbilt

    BESTfit Polished Aluminum Air Tank For Peterbilt

    BESTFIT TRUCK PARTS

    $387.99 - $407.99
    Reliable, corrosion-resistant, and stylish, the BESTfit Polished Aluminum Air Tank is engineered for Peterbilt trucks. Choose from 9.5 33.5-inch or 8 30-inch sizes for dependable air storage, and...
    PPR_300539
    SKU:
    PPR_300539
    Product Type:
    Air, Electrical, & Safety
    Diameter Options:
    9 1/2 Inch
    Finish Options:
    Polished
    Make:
    Peterbilt
    Rating:
    150 PSI
    Truck Class:
    Heavy Duty
    Diameter Options:
    8 Inch
    Material Options:
    Aluminum
    Ready To Ship:
    Yes
    $387.99 - $407.99
    Qty in Cart: 0
    Price:
    $387.99 - $407.99
    Subtotal:
  • Total: items /

Adding your products to cart

Discover Peterbilt 379 Rear Crossmember Designs

Reinforce your truck's structural support with Peterbilt 379 Frame Crossmembers & Covers. This lineup of aftermarket products includes high-quality fiberglass and stainless steel rear frame covers, fuel tank filler frames, rear frame covers, replacement cross members, and other essential components to keep your truck's frame in top condition. Handle the demands of commercial hauling with the best-in-class cross members featuring durable, stainless steel materials, corrosion-resistant finishes, and easy installation instructions. If you're looking for improved structural integrity for your frame, secure mounting points, and better load management, invest in quality frame cross members and covers to bolster your Peterbilt 379.

Frequently Asked Questions About Peterbilt 379 Frame Crossmembers & Covers

What are frame crossmembers and covers used for on a Peterbilt 379?

Frame crossmembers are structural components that run horizontally between the frame rails, providing rigidity and support to the chassis. Covers are typically used to shield these crossmembers or nearby frame sections from road debris, moisture, and corrosion while also giving the underside of the truck a cleaner, finished appearance.

Will these crossmembers and covers fit my specific Peterbilt 379 model year?

Peterbilt 379 frames can vary slightly depending on the model year and how the truck was originally configured, so it is important to check listed specifications such as frame rail width, mounting hole patterns, and wheelbase before purchasing. If you are unsure about fitment, reach out to our team with your VIN or frame measurements so we can help confirm compatibility.

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

Most crossmembers and covers in this category are made from steel or aluminum, depending on the specific part and intended use. Steel components typically offer higher strength for structural applications, while aluminum covers are often chosen for reduced weight and natural corrosion resistance. Finish options may include raw metal, painted, or powder-coated surfaces to help protect against rust and wear from road exposure.

Are these parts a direct bolt-on replacement, or will modifications be needed for installation?

Many crossmembers and covers are designed to bolt into the existing mounting points on the frame, but installation can vary based on the part and whether your truck has had prior frame modifications. We recommend reviewing the product description for specific installation notes and having a qualified technician inspect your frame before installation, especially for structural crossmembers.

Do frame crossmembers affect the structural integrity or warranty of my truck?

Crossmembers play a role in the overall strength and stability of the frame, so it is important to select a part rated for your truck's application and to have it installed correctly. Improper installation or using a part not suited for your frame configuration can affect performance and safety. If your truck is still under any manufacturer or aftermarket warranty, check with the applicable warranty provider before making frame-related changes.


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