73-87 Chevy & GMC C10 Rear Frame Crossmember (Bolt-On)

73-87 Rear Frame Crossmember - # 130-8300

Squarebody trucks are built like tanks—until you cut them up to lay them low. If you've notched or backhalved your 1973–1987 C10, you've likely removed the factory rear crossmember, leaving the tail end of your open C-channel frame free to twist, flex, and stress under load.

This heavy-duty, bolt-in crossmember is the ultimate chassis fix. It bridges the gap between your rear frame rails, boxing the rear section to easily handle modern drivetrain torque and aggressive aftermarket suspension setups.

Forget trying to hold heavy steel in place while guessing at alignment. Our design utilizes innovative internal sliding sleeves that slide right inside the frame channels. They act as a built-in alignment jig, squaring up the chassis perfectly and creating a bulletproof, double-walled connection once bolted down.

Key Features & Benefits

• Designed specifically for 1973-1987 C10 frames

• Reclaims structural integrity lost during aggressive drops and C-notch installs.

• End to C-channel frame flex, bed misalignment, and long-term metal fatigue.

• Bolt-in design with internal frame inlays for added support
  

Design & Construction

• ASTM A1011 hot-rolled steel 

• Precision-cut for consistent fitment

• Internal frame inlays slide into the frame rails for added strength
  

Dimensions & Specs

• Weight: 18 lbs

• Overall Length: 32.5 inches

• Frame Rail Inlays:

  • Height: 4.25 inches

  • Depth: 2.5 inches

• Crossmember Face:

  • Height: 4.5 inches

  • Depth: 2.75 inches

Vehicle Fitment

• 1973-1987 Chevy & GMC C10 Trucks
  

Installation Notes

• Inlays slide into frame rails to align with OEM bed mount holes. (Longer bolts may be required for bed variant)

• On rare occasions, since the stock frame rails have nothing supporting the rear, they tend to bow in over time, narrowing close to an inch; this will require spreading the frame rails via porta power or another accessible tool.

• Welding not required (can be welded if desired)

What’s Included

• (1) Rear Frame Crossmember with Logo
  

• (2) 3/8 x 1.25" Bolts
  

• (2) 1/2 x 1.25" Bolts
  

• (4) 3/8 Washers
  

• (4) 1/2 Washers
  

• (2) 3/8 Nylock Nuts

• (2) 1/2 Nylock Nuts

California Proposition 65 Warning

Cancer and Reproductive Harm – www.p65warnings.ca.gov

Questions? Contact Us

(480) 940 1806 – Local
1 (877) 951-1890 – Toll Free