6426 – 1973-1987 GM C10 Rear Frame Brace
Installation Pictures
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.
Key Features & Benefits
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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?
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Stronger, more stable chassis – reduces unwanted flex and twist during acceleration, cornering, and towing.
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Better handling response – makes the truck feel more planted and predictable.
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Supports high-power builds – essential when adding horsepower, lowering, or stiffening the suspension.
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Fuel system upgrade friendly – integrates seamlessly with top aftermarket tank solutions.
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Future-proof your frame – protects from fatigue and frame damage as your C10 sees more performance use.
PRODUCT FEATURES
- Reduces frame rail flex
- Precision Laser-Cut Construction
- Fuel Tank Mount Ready
- Custom Mount Capable
- Pro-Touring & High-Performance Approved
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.
THIS PRODUCT FEATURES
Designed & Manufactured in the USA
Durable Powder-Coat
North American Raw Materials
Precision Laser Cut Components
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| 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 | Black, Red |
UMI Performance
21 Years In The Industry
North American Raw Materials
Proudly partnering with leading USA steel suppliers, we source the finest North American mined and milled steel
Precision Bent DOM Tubing
Machine-guided DOM tubing bends maintain correct geometry while maintaining material strength.
Laser Cut Plating
We take North-American sourced plating and precision-cut each component with the latest laser-cutting technology.
Durable Powder Coating
Each finished part is properly prepped and coated with high quality Tiger Dry Lac powder coat, providing a tough long-lasting finish.
Consistent Welds
Our highly-skilled welders and robotic-welders provide consistent welds and ultimate part penetration.
100% USA Made
We take pride in providing 100% USA-Manufactured suspension components.
Shipping Guidelines
Flat Rate Shipping ($12.95) is only offered on Retail orders over $149 shipped via Ground in the Continental United States.
All International customers are responsible for any applicable duties and/or taxes incurred on your shipment upon delivery.
Return Information
All returns are subject to the authorization of UMI Performance, Inc. Please email [email protected] for a Returned Merchandise Authorization (RMA) number. Our Sales team will either authorize or deny the request for return at its discretion. Any product returned without an issued RMA number will not be credited. All returns must be made within 30 days of delivery, be in new condition, be in original sealed packaging and include the RMA number on the outside of the packaging. No exceptions. All products and their packaging must be in new and unopened condition. Products that have been altered, installed, or modified are not returnable. All shipping costs for returns are the responsibility of the customer. All returns are subject to a 20% restocking fee as well as the original shipping charges that UMI Performance may have incurred while shipping your order.
Due to the majority of Viking products being drop shipped, we can not offer returns on any Viking products. If you purchase a Viking product be sure it fits your application. If you need technical assistance prior to placing order please contact [email protected]
This '6426 - 1973-1987 GM C10 Rear Frame Brace' fits the following platforms:
1973-1987 GM C10/C15
- 1973 1974 Chevrolet C10 Pickup
- 1975 1986 Chevrolet C10
- 1987 1987 Chevrolet R10
- 1973 1974 GMC C15/C1500 Pickup
- 1979 1986 GMC C1500
- 1975 1978 GMC C15
- 1987 GMC R1500
This 6426 - 1973-1987 GM C10 Rear Frame Brace fits the following vehicles:
1974
Chevrolet C10 Pickup
- 1973 1974 Chevrolet C10 Pickup
GMC C15/C1500 Pickup
- 1973 1974 GMC C15/C1500 Pickup
1986
Chevrolet C10
- 1975 1986 Chevrolet C10
GMC C1500
- 1979 1986 GMC C1500
1987
Chevrolet R10
- 1987 1987 Chevrolet R10
1978
GMC C15
- 1975 1978 GMC C15
GMC
R1500
- 1987 GMC R1500
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