Description
Product Overview
Transform the ride and handling of your classic build with the Scott’s Hot Rods M-42-14-PT 4-Bar Rear Suspension Kit. Engineered for enthusiasts who refuse to compromise, this complete bolt-in system replaces outdated leaf spring or parallel bar setups with a modern, triangulated 4-link design that provides exceptional axle control, reduced wheel hop, and a smooth, predictable ride quality.
Crafted from heavy-walled DOM steel tubing and featuring precision-formed brackets, this kit is designed for a straightforward installation into a wide range of street rod and custom chassis. The inclusion of a adjustable panhard bar ensures precise lateral axle location, maintaining perfect centering throughout the suspension’s travel. Whether you’re running a Ford 9-inch, Chevrolet 12-bolt, or a Currie Enterprises rear end, this kit delivers the geometric foundation for both aggressive cornering and comfortable cruising.
Forget the harshness of a traditional setup. The Scott’s Hot Rods 4-Bar kit allows you to fine-tune your ride with a choice of coil-over shocks or air springs, giving you the flexibility to achieve your desired stance and handling characteristics. This is the ultimate upgrade for anyone serious about building a modern-performing classic.
📚 Learn More: Chassis Tech Articles
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Parallel vs. Triangulated 4-Bar Suspension: Which is Right for Your Project?
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The Ultimate Guide to Choosing Shocks and Springs for Your Hot Rod
Technical Specifications
| Specification Category | Detail |
|---|---|
| Manufacturer Part Number | M-42-14-PT |
| Kit Type | Triangulated 4-Bar Link with Panhard Bar |
| Material | DOM Steel Tubing & Laser-Cut Brackets |
| Finish | Powder-Coated (Specify Color) |
| Axle Housing Diameter | Fits 3.0″ Diameter Housings (e.g., Ford 9-inch) |
| Mounting Style | Bolt-In (May Require Minor Welding for Brackets) |
| Panhard Bar | Included, Adjustable |
| Spring/Shock Type | Coil-Over Shock or Air Spring (Not Included) |
| Joint Type | High-Misalignment Polyurethane or Rod Ends (Specify) |
What’s Included
| Included | Not Included / Required Separately |
|---|---|
| ✓ (4) Precision-Length 4-Bar Links | ✗ Coil-Over Shocks or Air Bag System |
| ✓ Upper & Lower Link Mounting Brackets | ✗ Rear End / Differential Assembly |
| ✓ Adjustable Panhard Bar & Frame Bracket | ✗ Brake System Components |
| ✓ All Necessary High-Strength Hardware | ✗ Wheels & Tires |
| ✓ Detailed Installation Instructions |
🛠️ Complete Your Chassis Build
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Suspension: Viking Performance Double-Adjustable Coil-Over Shocks
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Rear End: Currie Enterprises Ford 9-inch Currie Center Section
Comparison Table: 4-Bar vs. Leaf Spring vs. Parallel 4-Link
| Feature | Scott’s Triangulated 4-Bar | Stock Leaf Springs | Parallel 4-Link w/ Panhard |
|---|---|---|---|
| Axle Control | Excellent (Minimizes Wheel Hop) | Poor (Prone to Wrap-Up) | Very Good |
| Ride Quality | Smooth & Adjustable | Harsh & Stiff | Firm |
| Lateral Location | Panhard Bar for Positive Centering | Leaf Springs (Imprecise) | Panhard Bar |
| Installation Complexity | Moderate (Bolt-In Brackets) | Simple | Complex (Requires Frame Notching) |
| Adjustability | High (Instant Center, Pinion Angle) | None | High |
| Ideal For | Performance Street, Pro-Touring | Stock Restorations | Drag Racing |
Frequently Asked Questions (FAQs)
Q1: Is this a true “bolt-in” kit, or is welding required?
A: The Scott’s Hot Rods kit is designed for maximum bolt-in convenience. The links and panhard bar are fully adjustable and bolt together. However, the axle and frame brackets typically require welding for permanent, secure attachment. Always refer to the instructions for your specific application.
Q2: What is the advantage of a triangulated 4-bar over a parallel 4-link?
A: A triangulated 4-bar system, like this one, does not require a separate panhard bar for lateral location. The upper bars are angled inward, creating a triangle that controls both forward/backward and side-to-side movement. The Scott’s kit includes a panhard bar for even greater precision and is a common design for street-driven applications where space is less constrained than in drag racing.
Q3: Will this kit work with my stock rear end?
A: This kit is designed to work with common aftermarket rear ends, specifically those with a 3.0-inch diameter housing like a Ford 9-inch. If you have a stock rear end (e.g., a GM 10-bolt or 12-bolt), you will likely need to purchase and weld on the appropriate diameter mounting brackets. Check with the manufacturer for specific bracket kits.
Q4: Do I need to set the pinion angle myself?
A: Yes. A key benefit of a 4-link system is the ability to fine-tune the pinion angle. The adjustable links allow you to set the angle perfectly for your application, which is critical for preventing driveline vibration. We recommend a 1-2 degree negative pinion angle for most street-driven cars.
Q5: Are coil-over shocks or an air ride system better for this kit?
A: This depends on your goal:
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Coil-Overs: Ideal for maximum handling performance and a consistent ride height. Choose these for pro-touring builds.
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Air Ride: Ideal for adjustable ride height and stance. Allows you to lift the car for driveability and lower it for show.
Internal Link: Still unsure? Our guide on Coil-Overs vs. Air Ride: Choosing Your Suspension breaks down the pros and cons in detail.
Pros and Cons
| Pros | Cons |
|---|---|
| Superior Handling & Traction: Eliminates wheel hop and improves cornering stability. | Not a True 100% Bolt-On: Axle and frame brackets require welding for safe installation. |
| Fully Adjustable: Allows for precise tuning of pinion angle and instant center. | Higher Cost: Significant investment compared to rebuilding a stock leaf spring setup. |
| Modern Ride Quality: Provides a smoother, more controlled ride over rough surfaces. | Requires Additional Parts: You must purchase coil-overs or an air ride system separately. |
| Clean, Custom Look: Enhances the appearance of the chassis with a professional look. | Technical Installation: Requires a good understanding of suspension geometry for optimal setup. |
| Bolt-Together Links: Adjustable links simplify installation and fine-tuning. |
Conclusion & Ideal Use Case
The Scott’s Hot Rods M-42-14-PT 4-Bar Rear Kit is the definitive choice for the builder who views the chassis as the foundation of a great driving experience. It is not merely an upgrade; it’s a transformation that brings modern handling dynamics to a classic vehicle.
This kit is perfectly suited for:
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1930-1948 Ford Coupes & Sedans
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1949-1954 Chevy & Ford Cars
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Pro-Touring & Restomod Builds
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Custom Street Rods
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Any project where precise handling and a quality ride are non-negotiable.
If you’re building a cruiser that can confidently handle a winding road, this suspension system provides the engineering and quality to make it happen.
🔗 Official Technical Resource
For detailed CAD drawings, installation templates, and full technical specifications, visit the Scott’s Hot Rods Official Technical Library for the most accurate and application-specific information.
