Ford Bronco Radius Arm Bushing Replacement Guide (1981-1986)
Fix steering wander and front-end clunks by choosing the right radius arm bushings for your TTB-equipped Bronco.
- Symptoms of failure include steering wander, clunking noises from the front end, and uneven tire wear.
- The main choice is between polyurethane (firmer, more durable) and rubber (more flexible, more comfortable).
- If your Bronco is lifted, use 'degreed' bushings to correct the suspension angle and prevent premature wear.
- Installation can be difficult due to factory rivets that may need to be cut off and replaced with Grade 8 bolts.
Is Your Bronco Wandering or Clunking? Check Your Radius Arm Bushings
If you're feeling a clunk under your floorboards or fighting to keep your Bronco straight on the highway, there's a good chance your radius arm bushings are worn out. These parts are a common failure point on 1981-1986 Broncos and can cause a range of front-end issues. When they fail, the metal radius arm can move around excessively inside its frame bracket, leading to poor handling and noise.
Symptoms of Bad Radius Arm Bushings
- Steering Wander: A constant need to correct the steering to keep the truck driving straight, which an alignment won't fix.
- Clunking or Popping Noises: You might hear a clunk from the front end when going over bumps, braking, or even shifting from Drive to Reverse.
- Uneven Tire Wear: Worn bushings can affect your alignment, leading to cupping or other strange wear patterns on your front tires.
- Poor Braking Stability: The front end may feel like it dives or shifts when you apply the brakes.
Choosing Aftermarket Bushings: Polyurethane vs. Rubber
Original Ford rubber bushings for a truck this age are likely discontinued. The aftermarket, however, offers two main choices: traditional rubber and modern polyurethane. Your driving style and whether your Bronco is lifted will determine the best choice for you.
Tier 1: Polyurethane (Energy Suspension, Prothane, Skyjacker)
Polyurethane is a type of plastic that is much firmer and more durable than rubber.
- Pros: Sharper steering response, less deflection under braking, and a longer lifespan. They are resistant to oil and road grime that can destroy rubber.
- Cons: They can make the ride noticeably stiffer or harsher. Some users report that because they don't flex as much, they can crack under extreme off-road articulation or put more stress on the mounting points.
- Brands: Energy Suspension and Prothane are popular choices, with some forum users suggesting Energy Suspension is a slightly harder compound. Skyjacker also offers polyurethane bushings, often included with their lift kits.
Tier 2: OEM-Style Rubber (Dorman)
This is the classic, budget-friendly choice that restores the original ride feel.
- Pros: Provides a more comfortable, quieter ride by absorbing more vibration. Rubber is more flexible, making it a preferred choice for some off-roaders who need maximum suspension travel without the bushing cracking.
- Cons: Rubber wears out faster than polyurethane. It can soften, crack, and fail over time, especially when exposed to the elements.
- Brands: Dorman is a widely available brand that provides reliable, OEM-style replacement parts. Other brands like Moog also offer quality rubber replacements.
Pro Tip for Lifted Broncos
If your Bronco has a suspension lift of 2 inches or more, standard bushings will be held at a constant, stressful angle. Look for "degreed" or "offset" radius arm bushings. These are specially designed with a built-in angle to compensate for the lift, which reduces stress and helps them last much longer.
A Note on Installation
Replacing the radius arm bushings can be a tough job. The original brackets are often attached to the frame with heavy-duty rivets that must be cut, torched, or drilled out. When you remove the rivets, you must replace them with high-strength Grade 8 bolts and nuts to ensure the bracket is secure. If you're not comfortable with this level of work, it's best to have a professional shop handle the installation.
Estimated Costs
| Part Type | Part Cost | Estimated Labor Cost |
|---|---|---|
| Aftermarket Polyurethane Kit | $31 - $40 | $250 - $500 |
| Aftermarket Rubber Kit | $31 - $40 |
Frequently Asked Questions (FAQ)
Which is truly better for my Bronco, rubber or polyurethane?
It depends on your priorities. If you want a firm, responsive feel for on-road driving and maximum durability, choose polyurethane. If you prioritize a comfortable ride or do serious off-roading that requires a lot of suspension flex, rubber is often the better, more forgiving choice.
Do I need a front-end alignment after replacing the bushings?
Yes. The radius arm bushings have a significant impact on front-end geometry. A full front-end alignment is highly recommended after replacement to ensure proper handling and prevent premature tire wear.
Can I replace just one side?
It is always recommended to replace suspension components like bushings in pairs. If one side is worn out, the other is likely not far behind. Replacing both at the same time ensures even handling and predictable performance.
Are there any recalls on 1981-1986 Bronco radius arm bushings?
No. Searches of the NHTSA database and other records show no specific recalls or Technical Service Bulletins (TSBs) for the radius arm bushings on the 1981-1986 Ford Bronco.
Technical Specifications
The primary specification is the material: Polyurethane or Rubber. Polyurethane offers a harder durometer for performance, while rubber provides more flex and absorption. For lifted vehicles, 'degreed' or 'offset' bushings are a key specification to look for.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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- 🛍️ Shop This Part
- Is Your Bronco Wandering or Clunking? Check Your Radius Arm Bushings
- Symptoms of Bad Radius Arm Bushings
- Choosing Aftermarket Bushings: Polyurethane vs. Rubber
- Tier 1: Polyurethane (Energy Suspension, Prothane, Skyjacker)
- Tier 2: OEM-Style Rubber (Dorman)
- Pro Tip for Lifted Broncos
- A Note on Installation
- Estimated Costs
- Frequently Asked Questions (FAQ)
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