Product Description:
UMI Performance C10 Rear Frame Brace – Squarebody Rear Crossmember
The UMI Performance Rear Frame Brace (P/N 6426) is the ultimate way to strengthen the back end of your 1973-1987 Chevy or GMC C10, reducing frame flex and providing a solid mounting foundation for fuel tanks and performance upgrades.
Designed with laser-cut, tab-and-slot precision construction, this rear crossmember ties the frame rails together with race-proven rigidity—perfect for Pro-Touring and performance street trucks. Whether you’re building a high-horsepower LS swap, installing a Tanks Inc. fuel tank, or just tightening up an aging chassis, the UMI rear frame brace delivers superior strength and fitment.
Best of all, this brace is already included in UMI’s 6428 C10 4-Link Suspension Systems, but is also available separately for custom builds or incremental upgrades.
PRODUCT FEATURES
- Reduces frame rail flex
- Precision Laser-Cut Construction
- Fuel Tank Mount Ready
- Custom Mount Capable
- Pro-Touring & High-Performance Approved
Key Features & Benefits
Reduces Frame Rail Flex
Eliminates the weak points of the OEM C10 frame by bracing the rear section, improving handling, chassis stability, and drivetrain alignment under load.
Precision Laser-Cut Construction
Tab-and-slot manufacturing ensures an exact fit, easy alignment, and maximum structural integrity. Designed and built in the USA from premium materials.
Fuel Tank Mount Ready
Pre-drilled mounting holes for tank straps and tank flange—no need for templates or guesswork. This makes aftermarket tank installation faster, cleaner, and more secure.
Custom Mount Capable
The strong, boxed design can also be used as a foundation for custom rear accessories by builders and fabricators.
Pro-Touring & High-Performance Approved
Ideal for C10s running wide tires, coilover conversions, or 4-link setups—helping the chassis keep up with the improved suspension geometry.
Why Add a Rear Frame Brace to Your Squarebody?
- Stronger, more stable chassis – reduces unwanted flex and twist during acceleration, cornering, and towing.
- Better handling response – makes the truck feel more planted and predictable.
- Supports high-power builds – essential when adding horsepower, lowering, or stiffening the suspension.
- Fuel system upgrade friendly – integrates seamlessly with top aftermarket tank solutions.
- Future-proof your frame – protects from fatigue and frame damage as your C10 sees more performance use.
PRODUCT FAQ
Q: What does the rear frame brace do on my C10?
A: The UMI Performance Rear Frame Brace ties together the rear frame rails, significantly reducing frame flex and twist. This improves chassis rigidity, enhances handling, and keeps suspension geometry more stable during hard acceleration, cornering, or towing.
Q: Do I need this brace if I already have a 4-link kit?
A: If you’re running the UMI 6428 fuel tank relocation kit, the rear brace is already included. However, if you’re upgrading in stages or keeping a leaf spring setup, adding the brace is an easy way to improve rear chassis strength.
Q: Will it help with handling and stability on a street truck?
A: Yes — less frame deflection means more predictable suspension movement, better alignment retention, and a tighter, more responsive driving feel.
Q: Is this brace only for racing or Pro-Touring builds?
A: While it’s extremely beneficial in high-performance situations, it’s also a great upgrade for street-driven trucks, especially if you’ve added wider tires, more power, or plan to carry loads.
Q: Can I use it to mount my fuel tank?
A: Absolutely. The brace includes pre-drilled provisions for Tanks Inc. tank straps and flange, making it easy to integrate an aftermarket fuel system.
Q: Is any welding required?
A: In most cases, the installation is bolt-on, but some builds or custom applications may require minor fabrication for additional mounting points or accessories.
Fitment
1973-1987 GM C10/C15
Platform
1973-1987 GM C10/C15
Manufacturer
UMI Performance
Direct Bolt-On
No
Material
Mild Steel
Modifications
Cutting,Drilling
Finish
Powder Coat
UOM
Pair
Hardware
Included
Color
Red,Black
