SPEEDWAY MOTORS 91034457-DLX Weld Ifs Suspension Crossmember Kit Autocross

( Brand: Speedway Motors ), ( Manufacturer Part Number: 91034457-DLX ), ( Type: Crossmembers ), ( Placement On Vehicle: Front ), ( Material: Steel ), ( Item Length: 31.00 ), ( Item Height: 6.000 ), ( Item Width: 10.000 ), ( Finish: Natural ), ( California Prop 65 Warning: True )

Review SPEEDWAY MOTORS Ford Weld in Ifs Suspension Crossmember Kit Autocross fits MUSTANG 1964–1970

The **Speedway 91034457-DLX Weld-In Independent Front Suspension (IFS) Crossmember Kit for the 1964 1970 Ford Mustang** is a meticulously engineered, high-performance upgrade designed to transform the stock front suspension of your classic Mustang into a rigid, precision-tuned platform capable of handling the demands of autocross, track days, and spirited driving with confidence. This kit replaces the original solid front axle with a modern, lightweight, and ultra-stiff weld-in crossmember, complete with integrated mounting points for a full independent front suspension (IFS) setup, including coilovers, control arms, and sway bars. Crafted from high-grade, heat-treated steel, the crossmember is precision-machined to ensure perfect alignment and fitment, eliminating flex and improving handling responsiveness while maintaining the iconic look of your Mustang. The DLX version includes additional reinforcement features, such as reinforced gussets and optimized weld tabs, to distribute stress evenly across the frame rails, enhancing durability under heavy cornering loads and aggressive autocross maneuvers. Whether you're running a full IFS conversion with coilovers, sway bars, and poly bushings or simply upgrading your existing setup for better stiffness, this kit provides the structural backbone needed to turn your Mustang into a true performance machine. Perfect for enthusiasts who demand both authenticity and cutting-edge performance, the Speedway kit ensures a seamless integration with OEM body panels while delivering the rigidity and control required for competitive autocross racing or high-speed track use.

### **Pros and Cons of buying a Speedway 91034457-DLX (1964 1970 Ford Mustang Weld-In IFS Suspension Crossmember Kit for Autocross)**

#### **Pros**

1. **Enhanced Structural Integrity** The weld-in crossmember reinforces the suspension and chassis, reducing flex and improving handling stability, which is critical for autocrossing where precise control is required.

2. **Improved Weight Distribution** By reinforcing the front suspension area, the kit helps balance weight more evenly, reducing body roll and improving cornering performance.

3. **Durability and Longevity** Made from high-quality steel, this kit is designed to withstand the stresses of autocrossing, including repeated impacts and high-G maneuvers, reducing the risk of suspension failure.

4. **Compatibility with Performance Mods** Since the Mustang s original suspension was not built for aggressive driving, this kit allows for better integration with aftermarket sway bars, coilovers, and other performance upgrades.

5. **Easier Installation of Additional Parts** The reinforced structure provides mounting points for auxiliary components like roll cages, additional bracing, or even custom suspension setups.

6. **Cost-Effective Reinforcement** Compared to full roll cages or extensive chassis reinforcement, this kit offers a budget-friendly way to significantly improve structural rigidity.

7. **Autocross-Specific Design** The kit is tailored for track use, meaning it addresses common weak points in the original suspension that could lead to failure under heavy cornering loads.

8. **Preservation of Original Aesthetics** Unlike some aftermarket suspension upgrades that require extensive modifications, this weld-in kit maintains the stock look while improving performance.

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#### **Cons**

1. **Welding Required** Installation necessitates professional welding skills or access to a welder, which may not be feasible for DIY enthusiasts without experience. Improper welding can compromise structural integrity.

2. **Potential for Overkill** If the Mustang is primarily used for street driving rather than autocrossing, the added weight and cost may not be justified. The benefits are most noticeable in high-performance scenarios.

3. **Cost** While not excessively expensive, the kit adds to the overall budget of a project car. For a stock Mustang, this may be seen as an unnecessary expense unless autocrossing is a priority.

4. **Limited Aftermarket Support** Unlike common suspension upgrades (e.g., coilovers or sway bars), this specific kit may not have as much community documentation or troubleshooting resources available.

5. **Time-Consuming Installation** Welding and fitting the crossmember properly can take several hours, especially if adjustments are needed for alignment or clearance.

6. **Potential for Misalignment** If not installed correctly, the kit could interfere with suspension geometry, leading to uneven tire wear or handling issues.

7. **Not a Standalone Performance Upgrade** While beneficial, this kit should be paired with other performance modifications (e.g., stiffer springs, sway bars, or alignment adjustments) to see maximum benefits.

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### **Conclusion**

The Speedway weld-in crossmember kit is a **highly specialized but valuable upgrade** for Mustang owners who participate in autocrossing or plan to push their cars to their limits on the track. Its primary strength lies in **structural reinforcement and handling stability**, making it ideal for drivers who prioritize performance over pure aesthetics or street comfort. However, it is **not a universal fix** it requires proper installation, is best suited for track-focused builds, and may not justify the cost for casual drivers.

If autocrossing is a serious endeavor and the Mustang s original suspension is a weak point, this kit is a **smart investment**. For street-only Mustangs or those on a tight budget, the benefits may not outweigh the effort and expense.

### **Recommendation**

- **Buy if:** You autocross regularly, want to reinforce your Mustang s suspension, and are willing to invest in professional welding or have the skills to install it correctly.

- **Skip if:** Your Mustang is primarily a street car, you lack welding experience, or you prefer simpler, more common suspension upgrades.

- **Pair with:** Stiffer springs, sway bars, coilovers, and proper alignment to maximize performance gains.

For the best results, consult with an experienced Mustang suspension specialist or autocrosser before purchasing to ensure it aligns with your specific goals and build plan.

Details:

Also fits 1967-1970 Mercury Cougar model's as well. Yes, I recommend this product. Front steer rack-and-pinion steering provides greater feel. Notes: Must use rear sump oil pan.

Good instructions and good quality crossmember for the price. Note, lower control arm pivot tubes and gussets are not included, as they typically included with tubular kits. Rack-and-pinion mounting points rotated rearward 20 degrees for steering shaft clearance. All welds ground smooth, saving you time and energy during installation.

Cleveland engines will not work. Raised engine placement may require a high-rise hood. Part # 91034457-DLX Condition New Brand Speedway Motors Sold Each Details. Accepts stock Mustang II spindles or aftermarket drop.

Vastly improved handling when compared to original suspension. Crossmember fit snug and can't wait to get tubular A arms installed. Built-in anti-dive and bump steer correction mounting points. Application specific crossmember and spring towers pre-welded to save installation time.

Lower control arm pivot tubes and corner gussets not included. Headquarters. I would buy the Speedway brand instead of Heists brand, both are made in same factory. Our crossmember requires tubular lower control arms and will not work with stock that utilize a strut rod.

Welding our Mustang II suspension crossmember into place is a straightforward installation and can be handled in just few short hours once the old straight axle front have been removed. Vertical inner uprights provide a strong design with twice the weld area. Notched the frame for spring pockets like instructions said. You'll be in for some hair raising steering feel, or lack thereof, when you get up to highway speed with the old system and Bendix-sourced power is getting harder find parts keep it functional leak free.

Made by Heists. Provides increased engine room for modern swaps. Complete weld-in assembly made from 3/16-inch steel adds strength. Compatible with manual and power rack-and-pinion steering systems.

This helps with exhaust manifold/header and overall engine clearance.

part #: 91034457 price

• $432.99

specifications engimou:

• for models: Mustang
• for makes: Ford
• for years: 1964-1970
• brand: Speedway Motors
• mpn: 91034457-dlx
• type: Crossmembers
• placement on vehicle: Front
• material: Steel
• item length: 31.00
• item height: 6.000
• item width: 10.000
• finish: Natural
• california prop 65 warning: True

seller engimou:

• city: Lincoln, NE
• # reviews: 356068
• rating: 99.8%

general engimou:

• Car Truck Parts Accessories > Engines Engine Parts > Engine Mounts
• condition: New

offer engimou:

• availability: In Stock
• options: Ship-to-home
• started: March 24, 2026
• sold: 0

returns engimou:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

payments engimou:

• wallet: Google-pay
• credit card: Visa
• other

shipping engimou:

• class: Standard, Expedited
• service: Standard, Expedited
• type: Fixed
• cost: $0.00
• transit: 6-6 Days

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