16 September 2026
Speak to one of our experts.
Speak to one of our experts.
15 October 2024
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Advice Blog
If you’re an MX5 Mk3 (NC) owner, you already know the thrill these cars provide on the open road. Mazda designed them with fun in mind, but if your rear differential carrier bushes are still the original rubber, it might be time for an upgrade. We’re excited to introduce the 27AY Rear Diff Carrier Bushes, designed specifically for your MX5 NC (2005-2015), engineered to exceed OEM specifications while preserving that factory comfort you love.
OEM rubber bushes are prone to degradation over time, particularly due to compression set—where the rubber permanently deforms after prolonged stress. This issue affects handling and ride quality, making your car feel sluggish and less responsive. Polybush’s polyurethane formula offers a brilliant solution to this problem. Unlike rubber, polyurethane is resistant to wear, heat, and oil, meaning it can maintain its shape and performance for far longer.
The 27AY bushes are designed to improve your MX5’s responsiveness without sacrificing the ride comfort you’re used to. Polybush’s material absorbs vibration and harshness while maintaining the rear differential’s position more effectively than standard rubber bushes. This upgrade translates into sharper throttle response, more precise gear changes, and overall enhanced handling.
One of the key reasons to swap out rubber for Polybush is longevity. While rubber wears out and cracks under the pressures of daily driving, our polyurethane bushes stay flexible and tough for years. So, whether you’re planning track days or want to keep your roadster in top condition for weekend drives, the 27AY bushes will ensure your MX5 stays on point, providing years of trouble-free performance.
The 27AY Rear Diff Carrier Bushes are part of our broader range of suspension upgrades for the MX5 NC. At Polybush, we’re committed to covering your car from top to bottom, offering you products that outperform the originals while maintaining the features that make your car so enjoyable to drive.
If you’re ready to transform the way your MX5 drives, then this is the perfect upgrade to keep your pride and joy in top shape.
OE Reference: Part of NE5539730,NE6139730
Bushes Per Vehicle Set: 2
Product Specifications:
– Bush Type: Rear Differential Carrier Bush
– Polybush Part Number: 27AY
– Grade: Dynamic
– Shore A Hardness: 75
– Bush Design: Top Hat
– Contains: 2 x Polyurethane Bushes
– Replaces OEM Part: Part of NE5539730, NE6139730, F15139730A
– Weight: 0.51kg
Vehicle Fitment:
Mazda MX5 Mk3 NC (2005-2015)
Mazda RX8 SE17 (2003-2012)
Why Choose Polybush?
If you’re replacing tired, perished rubber bushes, Polybush polyurethane bushes are a smart long-term upgrade. Here’s why:
– Longer Lasting: Polybush suspension bushes are designed to last significantly longer than standard rubber and are resistant to oil, road grime and age-related deterioration.
– Improved Handling: Polyurethane reduces unwanted flex, helping improve steering response, stability and suspension control.
– Comfort Maintained: Engineered to improve steering feedback and control while retaining a comfortable road-going ride.
– No Grease Required: Polybush products are designed for dry fitting, meaning no messy greasing during installation.
– Made in the UK: Manufactured entirely in the UK using Polybush’s specialist polyurethane formulations and production processes.
Key Benefits at a Glance:
– Direct replacement for your original suspension bushes.
– Improved suspension control and drivability
– Resistant to wear, chemicals, oil, UV and weathering
– Suitable for daily drivers, fast-road vehicles, classic cars, 4x4s and commercial applications
– Manufactured in the UK
– ISO 9001 accredited quality system
Ideal for:
– Daily Driven Vehicles: Restore suspension performance while maintaining OE-style comfort.
– Fast Road or Lightly Modified Cars: Improve suspension control without unnecessarily compromising ride quality.
– Classic or Older Models: Replace degraded, cracked or perished original rubber bushes with a durable polyurethane alternative.
– Fleet, Commercial, or 4×4 Vehicles: Improve durability and maintain consistent suspension performance in demanding applications.
Upgrade your bushes today with Polybush – A long-lasting, British-made solution for sharper handling and reliable comfort.
– Trusted UK Manufacturer – Polybush
16 September 2026
25 August 2026
