Rubber Body Mounts vs Polyurethane: Which Is Better for Your 4WD?
If you're replacing worn-out body mount bushes, one of the biggest decisions you'll face is whether to choose rubber body mounts or polyurethane body mounts.
While polyurethane is often marketed as the stronger upgrade, that doesn't necessarily make it the best option for most four-wheel drives. In fact, vehicle manufacturers have fitted rubber body mounts for decades because they provide the ideal balance of comfort, durability, flexibility, and vibration isolation.
For the majority of 4WD owners, high-quality rubber body mount bushes remain the better choice.
Why Do Body Mounts Matter?
Body mounts are the rubber bushes positioned between your vehicle's chassis and body. Their job is to securely support the body while absorbing road vibration, engine movement, and chassis flex.
As the original mounts age, they gradually compress, harden, or crack. This can lead to:
- Body movement between the chassis and cabin
- Squeaks and rattles
- Increased road noise
- More vibration inside the cabin
- Poor body alignment
Replacing worn body mount bushes can make an older 4WD feel noticeably tighter, quieter, and more comfortable to drive.
Why Manufacturers Use Rubber Body Mounts
Almost every factory 4WD leaves the production line with rubber body mounts, and for good reason.
Rubber is excellent at absorbing vibration while still allowing the small amount of controlled movement required between the chassis and body. This helps improve ride comfort, reduces noise, and minimizes stress on both the body and chassis.
Whether you're driving corrugated gravel roads, towing a trailer, or heading off-road, rubber helps isolate the cabin from the harsh impacts and vibrations generated underneath the vehicle.
Do Rubber Body Mounts Last?
Absolutely.
One of the biggest misconceptions is that rubber body mounts wear out quickly. In reality, genuine-quality rubber body mounts commonly last 20 to 30 years, and many factory mounts remain serviceable even longer.
Most replacements are simply due to age rather than poor design. After decades of exposure to heat, UV, moisture, road grime, mud, and thousands of kilometres of driving, even the best rubber will eventually begin to deteriorate.
For most owners, installing a new set of quality rubber body mount bushes is something they'll likely only need to do once during their ownership of the vehicle.
Rubber vs Polyurethane Body Mounts
Rubber Body Mounts
Advantages
- Maintains the factory ride quality
- Excellent vibration and noise isolation
- Reduces squeaks and rattles
- Allows natural chassis flex
- Comfortable for daily driving and touring
- Long service life, often 20–30 years or more
- OEM-style fit and performance
Disadvantages
- Can deteriorate after decades of use
- Less resistant to prolonged exposure to oils and certain chemicals
Polyurethane Body Mounts
Polyurethane is much harder than rubber, making it very durable, but that extra stiffness comes with compromises.
Advantages
- Highly resistant to oils, fuel, and chemicals
- Very resistant to wear and compression
Disadvantages
- Transfers more vibration into the cabin
- Can increase road noise
- Produces a firmer, harsher ride
- Can squeak if not lubricated correctly during installation
- Doesn't provide the same level of vibration isolation as rubber
Which Is Better for a Touring or Daily Driven 4WD?
For most four-wheel drives used on the road, for touring, towing, work, or weekend adventures, rubber body mounts are generally the better option.
Their ability to absorb vibration and maintain the comfortable ride quality the vehicle was designed to have is difficult to match. They also allow the controlled movement between the body and chassis that manufacturers intended.
Unless you're building a dedicated competition vehicle where maximum stiffness is the priority, most owners will appreciate the quieter, smoother driving experience that quality rubber body mounts provide.
Why We Choose Rubber Body Mounts
At Flatout Offroad, we supply high-quality rubber body mount bushing kits because we believe they offer the best overall solution for the vast majority of 4WD owners.
Our rubber body mount kits are designed to restore your vehicle to its original ride quality while providing the durability needed for years of reliable service. With proper materials and manufacturing, a quality set of rubber body mounts can easily provide another 20 to 30 years of dependable performance.
If your factory body bushes are cracked, compressed, or showing their age, replacing them with new rubber mounts will restore body stability, reduce unwanted movement, and improve overall driving comfort.
Final Thoughts
While polyurethane body mounts certainly have their place, they aren't automatically an upgrade for every vehicle.
If you value comfort, reduced vibration, quieter driving, and factory-style performance, quality rubber body mounts remain the best choice. They deliver the ride characteristics your 4WD was originally engineered to have while offering excellent durability that can last for decades.
For most owners, replacing worn factory bushes with new rubber body mount bushes is a simple investment that improves both the feel and longevity of their vehicle.