The Difference Between OE, OEM, and Aftermarket Undercar Parts

When it comes to maintaining your vehicle’s suspension and drivetrain, understanding the differences between OE, OEM, and aftermarket undercar parts is crucial. These terms are often used interchangeably, but they each carry important distinctions—especially in terms of quality, performance, and value. At GSP North America, we manufacture stronger-than-OEM undercar components that give drivers and mechanics a reliable alternative to dealership pricing and generic brands.

Let’s break down what these terms mean and how to make the best choice for your vehicle.

What Are OE Parts?

OE stands for Original Equipment, which refers to the parts that came installed on your vehicle when it was brand new from the factory. These parts were manufactured specifically for the automaker, often by a third-party supplier under strict quality and fitment requirements.

• Example: A CV axle or control arm installed by Ford at the factory.

• Pros: Guaranteed fit, meets manufacturer standards.

• Cons: Usually only available through a dealership and comes with a high price tag.

What Are OEM Parts?

OEM stands for Original Equipment Manufacturer. These parts are made by the same manufacturer that supplied the original part to the automaker—but sold under the manufacturer’s brand, not the vehicle brand.

• Example: If GSP built control arms for an automaker, but also sold the same design under the GSP name.

• Pros: Same design and quality as OE, often lower cost than dealer parts.

• Cons: May still be priced higher than comparable aftermarket options.

What Are Aftermarket Parts?

Aftermarket parts are made by companies not affiliated with the vehicle’s original manufacturer. These parts are designed to fit and function like the OE part—but many, including GSP components, go a step further by improving on OE weaknesses.

• Example: GSP’s reinforced CV axles and hub assemblies that are designed to be stronger than factory parts.

• Pros: Often more affordable, wider availability, potential performance and durability upgrades.

• Cons: Quality varies widely between brands—choosing a trusted manufacturer is key.

The GSP Difference: Aftermarket That Outperforms OEM

Not all aftermarket parts are created equal. At GSP North America, we bridge the gap between OEM quality and performance upgrades by designing parts that:

• Match OE fitment specs for easy installation

• Use improved materials and advanced engineering

• Include high-temp grease, heavy-duty boots, and corrosion-resistant coatings

• Are tested to meet or exceed industry standards

That means you get a part that fits like OEM—but is built to last longer and perform better under real-world conditions.

When Should You Choose Aftermarket Over OE or OEM?

There are many cases where aftermarket parts are the better choice:

• You want better durability: GSP parts are built stronger for longer life.

• You want to save money: Aftermarket is often more affordable than OEM.

• You need availability: Aftermarket parts are easier to source than dealer-only OE parts.

• You’re upgrading performance: Some aftermarket parts offer enhancements over stock specs.

The key is choosing a trusted brand like GSP—one that invests in quality, fitment, and real-world performance.

Shop Smart. Choose GSP.

OE and OEM parts may give you the confidence of fit and origin—but often at a premium price. Cheap aftermarket parts may save money up front, but cost you more in premature wear or poor performance. GSP North America offers the best of both worlds: parts that meet OE standards with the added value of modern engineering, rigorous testing, and long-term reliability.

Whether you’re a professional mechanic or a DIY enthusiast, GSP provides undercar components you can trust—mile after mile.