Factory length 1978 Ford Mustang II outer tie rod ends are steering components built to OEM specifications for accurate alignment and safe handling. These tie rod ends ensure correct suspension geometry for both manual and power steering models. Ideal for restorations and custom builds, they provide factory-fit reliability.
Stay tuned with us as we dive deeper into everything you need to know about factory length 1978 Ford Mustang II outer tie rod ends—from specs and fitment to installation tips and expert recommendations.
What Are Factory Length 1978 Ford Mustang II Outer Tie Rod Ends?
The factory length 1978 Ford Mustang II outer tie rod ends are essential components of the vehicle’s front steering and suspension system. These parts connect the steering rack to the front wheels, enabling precise directional control and safe handling. The term “factory length” refers to the original dimensions specified by Ford for the Mustang II in 1978. Maintaining this exact length is critical because even slight deviations can affect steering geometry, tire wear, and overall performance.
Originally designed as part of Ford’s compact and performance-oriented Mustang II lineup (produced from 1974 to 1978), these outer tie rod ends were engineered to provide a balance between responsiveness and comfort. Many classic car enthusiasts, restorers, and hot rod builders still use this platform, and keeping the suspension components true to factory dimensions ensures correct alignment and driving characteristics.
Understanding the significance of these tie rod ends starts with appreciating their role in maintaining toe alignment. When you turn the steering wheel, the inner and outer tie rods work together to move the wheel hub assemblies. If the outer tie rod ends are too short or long, steering responsiveness may become unpredictable, leading to dangerous driving conditions. That is why using factory length 1978 Ford Mustang II outer tie rod ends remains the gold standard for restoration projects and aftermarket upgrades alike.
OEM Dimensions & Specs for 1978 Mustang II Outer Tie Rod Ends
OEM (Original Equipment Manufacturer) specifications for the 1978 Ford Mustang II outer tie rod ends are precise and critical to performance. According to verified sources and auto parts catalogs, the correct factory length for these tie rod ends includes an overall length of approximately 5.5 inches, with a stud center-to-end length near 5.149 inches. The thread size is typically 9/16-inch with an 18 threads-per-inch pitch, while the stud diameter is around 0.5 inches.
Maintaining the OEM dimensions is crucial because it directly affects your Mustang’s front-end alignment. Incorrect tie rod lengths can cause a poor toe setting, resulting in uneven tire wear, compromised handling, and even premature suspension wear. In some catalog listings, there may be slight variations in length measurements (such as 88 mm or 3.46 inches from stud tip to end), but for most purposes, the OEM dimension remains the best reference for compatibility.
The Mustang II platform is especially popular for front-end swaps in hot rods and custom builds. Builders often replicate the original specs of the factory length 1978 Ford Mustang II outer tie rod ends to ensure the custom suspension geometry mirrors that of the original. This OEM standard has essentially become an industry benchmark due to its simplicity and performance. Whether you are restoring a Mustang II or using its suspension in a kit car or street rod, sticking to factory specs is non-negotiable.
Fitment Guide: Manual vs Power Steering Models (1974–1978)
One of the most common points of confusion among Mustang II owners and custom builders is the difference in tie rod fitment between manual and power steering versions. Ford made subtle changes throughout the Mustang II’s production years, and by late 1977 into 1978, the outer tie rod ends were largely standardized. However, earlier models featured different setups based on whether the car was equipped with manual or power steering.
For 1974 to mid-1977 Mustang IIs, outer tie rod ends often varied slightly in length and design between manual and power steering configurations. Power steering models sometimes used shorter tie rods with different internal thread depths to accommodate varied rack geometries. This means that if you try to swap parts between early and late models without confirming fitment, you risk misalignment and incompatibility.
The good news is that for late-1977 and all 1978 models, Ford streamlined the design. Both manual and power steering setups used the same outer tie rod ends with factory length specifications. This unification has made it easier for restorers and builders to source replacement parts. If you own a 1978 Mustang II, you can confidently purchase outer tie rod ends labeled as factory length without worrying about the steering system type. For those working on earlier years, it’s essential to double-check compatibility with the steering configuration to ensure accurate alignment.
Material & Durability: Steel vs Forged Aftermarket Tie Rod Ends
Material quality plays a significant role in the performance and longevity of outer tie rod ends. The factory length 1978 Ford Mustang II outer tie rod ends were originally made from high-strength steel, providing adequate durability for daily driving and moderate performance use. Today, aftermarket manufacturers offer various material upgrades that aim to surpass OEM standards.
One popular choice is forged steel. Unlike standard cast steel, forging involves compressing the metal under extreme pressure, aligning its grain structure for superior strength. Forged outer tie rod ends are often used in performance and racing applications where higher loads and forces are expected. They are more resistant to bending, cracking, and fatigue over time.
On the other hand, standard steel tie rod ends, while still durable, may not offer the same longevity under extreme use. For most classic car restorations or moderate street driving, high-quality OEM-style steel components are sufficient. However, if you plan to use your Mustang II in autocross, track days, or custom builds with wide tires and aggressive camber settings, opting for a forged upgrade might be worth the investment.
Corrosion protection is another factor. Many modern tie rod ends come with powder-coated finishes or zinc plating to resist rust. This adds another layer of durability, especially if the car is driven in varied weather conditions. Choosing the right material depends on your usage, but understanding the differences will help you select components that last and perform reliably.
Top Aftermarket Alternatives to Factory Length Tie Rod Ends
While OEM parts are ideal for originality, several high-quality aftermarket alternatives offer equal or improved performance with factory length specifications. One such product is the Unisteer 8024170 tie rod end, designed specifically for 1974–1978 Mustang IIs. It features a 9/16-18 thread pitch and an overall length that closely matches the factory dimensions.
Another trusted name is Moog, known for producing reliable suspension components. The Moog ES429RL is compatible with Mustang II setups and features a stud center length of approximately 3.40 inches. While it may not match the factory length perfectly, many hot rod builders use it successfully with slight modifications.
Flaming River also offers performance-grade outer tie rod ends such as the FR1601, which are compatible with Mustang II spindles and racks. These parts are designed for high-load applications and are popular among custom car builders.
Here is a brief comparison table for clarity:
| Brand | Model | Thread Size | Length (Approx.) | Notes |
| Unisteer | 8024170 | 9/16-18 | ~5.0″ | Closest to factory length |
| Moog | ES429RL | 9/16-18 | ~3.40″ | May require inner mod |
| Flaming River | FR1601 | 9/16-18 | ~5.0″ | High-performance build |
All these options can serve as direct replacements or upgrades depending on your specific needs. Just ensure the inner tie rod length and alignment are adjusted accordingly to maintain proper steering geometry.
Step-by-Step Installation for Factory-Length Outer Tie Rod Ends
Replacing your 1978 Mustang II outer tie rod ends is a straightforward process if approached carefully. Here’s a simplified installation guide:
- Lift and Secure the Vehicle: Use a hydraulic jack and place jack stands under the frame to safely elevate the front end.
- Remove the Front Wheels: This provides full access to the steering knuckles and tie rod ends.
- Loosen the Jam Nut: Use a wrench to loosen the jam nut on the inner tie rod. This helps maintain the correct alignment reference.
- Separate the Tie Rod from the Spindle: Use a tie rod separator or pickle fork to disconnect the outer tie rod end from the spindle.
- Unscrew the Old Tie Rod End: Count the number of turns it takes to remove the old part to replicate with the new one.
- Install the New Tie Rod End: Thread the factory length tie rod end in using the same number of turns.
- Reattach to the Spindle: Insert the stud into the spindle, then tighten the castle nut and secure it with a cotter pin.
- Tighten the Jam Nut: Lock the outer tie rod end in place.
- Install Wheels and Lower the Car: Recheck torque specs.
- Get a Professional Alignment: A crucial final step to ensure correct toe settings.
While the process seems simple, alignment is key. Even if you match thread counts, a professional alignment is always recommended to ensure factory specs are restored.
Maintenance Tips for Outer Tie Rod Ends on Mustang II
Proper maintenance of your 1978 Mustang II’s outer tie rod ends ensures long service life and optimal steering performance. Start by inspecting the tie rod ends regularly for signs of wear. Cracked or torn rubber dust boots are early indicators that grease may be leaking, which can lead to premature wear.
Many high-quality tie rod ends come with grease fittings (zerks), allowing you to apply fresh lubricant. Lubricate the joints every time you change your oil or at least twice a year. Use a high-quality chassis grease, and avoid over-lubrication, which can rupture the boot.
Also, watch out for signs like looseness in the steering wheel, unusual tire wear, or clicking sounds during turns. These can be signs of failing tie rod ends. If caught early, replacing them is straightforward. But if left unchecked, worn tie rods can lead to more expensive suspension and steering repairs.
Keeping your suspension clean also helps. Dirt and debris can damage the boots and accelerate wear. During any suspension service, always inspect both the inner and outer tie rod ends for play or corrosion.
Troubleshooting: Identifying Bad Outer Tie Rod Ends
Knowing how to identify bad outer tie rod ends can save you from dangerous driving conditions and more expensive repairs. The first and most common symptom is excessive play in the steering. If the car wanders or the steering wheel feels loose, the tie rod ends might be worn.
Another sign is uneven tire wear. When the tie rod ends can’t maintain correct toe alignment, your tires may show feathering or wear more on the inside or outside edges. Clunking noises, especially when turning or going over bumps, are also warning signs.
To diagnose at home, jack up the front of the car and grasp each front tire at the 3 and 9 o’clock positions. Try moving the tire side-to-side. If you feel excessive movement or hear a clunk, the tie rod ends may be loose.
For confirmation, a mechanic can check with more precision using a lift. Worn tie rod ends should be replaced immediately, as failure can lead to a complete loss of steering control.
OEM vs Aftermarket: Buying Guide for 1978 Mustang II
Choosing between OEM and aftermarket tie rod ends depends on your goals. OEM parts maintain originality, offer reliable fitment, and are typically sufficient for stock or lightly modified vehicles. If you’re restoring a show car or aiming for period-correct specs, OEM is the way to go.
Aftermarket options offer performance enhancements, such as forged construction, greaseable designs, or powder-coated finishes. Brands like Moog, Unisteer, and Flaming River are trusted by builders for their combination of strength and reliability. However, some aftermarket parts may differ slightly in length or design, requiring additional alignment adjustments.
Here’s a quick comparison:
| Feature | OEM | Aftermarket |
| Fitment | Exact | May need adjustment |
| Price | Moderate | Varies (can be higher or lower) |
| Performance | Good for daily driving | Better for performance builds |
| Material Quality | Steel | Forged, coated, greasable |
Ultimately, for everyday driving and authenticity, OEM remains dependable. For aggressive use or modern upgrades, aftermarket may offer more flexibility.
Conclusion: Why Factory-Length Outer Tie Rod Ends Matter
Maintaining the factory length 1978 Ford Mustang II outer tie rod ends is essential for preserving the vehicle’s original steering geometry, performance, and safety. These components play a pivotal role in how the car handles and how long your tires last. Deviating from the factory length can cause alignment issues and uneven tire wear.
Whether you’re restoring a classic Mustang II or building a hot rod using its suspension, choosing the correct tie rod ends ensures a reliable and predictable driving experience. By understanding OEM specs, fitment differences, material options, and installation methods, you’re well-equipped to make the best decision for your project.
FAQs
1.How to measure tie rod end length?
To measure tie rod end length, remove the part and use a caliper or tape measure to record the distance from the center of the ball stud to the end of the threaded shaft. This is the functional length used for alignment.
2.What size are the threads on a Mustang tie rod?
For a 1978 Ford Mustang II, the outer tie rod ends typically use a 9/16-inch thread size with an 18 TPI (threads per inch) pitch.
3.What are the symptoms of bad outer tie rod ends?
Common symptoms include loose or wandering steering, uneven tire wear, clunking noises during turns, and excessive play in the steering wheel.
4.What size are tie rod ends?
Tie rod ends vary by model and year. For the 1978 Mustang II, the factory length is about 5.5 inches, with a stud-center length near 5.149 inches.
5.Can I use aftermarket tie rod ends instead of OEM?
Yes, aftermarket tie rod ends can be used, especially for performance upgrades. Just ensure they match or are close to the factory length to avoid alignment issues.
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