Universal Joint Snap Ring

What Is a Universal Joint Snap Ring?

A universal joint snap ring is a small but critically important piece of hardware in your vehicle's driveline system. Snap rings — also called retaining clips or C-clips — are fasteners that hold the U-joint bearing caps securely in place within the yoke ears of a driveshaft. These fasteners hold bearing caps in place on the prongs of a cross piece by being installed in a groove; once installed, the exposed portion of the snap ring acts as a shoulder to retain the bearing cap.

The bearing caps of the U-joint are pressed into the yoke and held in place with a C-clip (half circle), an internal snap ring, or a full-circle snap ring. Each style serves the same essential purpose: keeping the bearing cap from working loose under the stress of normal driving and power transfer.

Why Snap Rings Matter for Your Driveline

It may be easy to overlook a small retaining ring, but the consequences of a failed or missing snap ring can be severe. Over time and under harsh conditions, C-clips tend to wear into irregular shapes and fall out. When the C-clip falls out, the U-joint's bearing cap will eventually work its way out of the yoke. Left unattended, the trunnion (pin) of the U-joint will damage the shape of the yoke — damage that is very difficult to repair and usually requires the purchase of a new inner or outer axle shaft or costly driveshaft repairs.

The snap rings hold the joint on the centerline of the yoke. A worn yoke moves the joint off the centerline and thereby shifts the attached driveshaft off its centerline, which can cause vibration. When accelerating, a faulty U-joint can throw your driveshaft out of balance, generating vibrations that can escalate as you speed up. A properly retained U-joint snap ring is your first line of defense against these issues.

Inside vs. Outside Snap Rings: Which Do You Need?

Snap rings come in two primary configurations: inside (internal) and outside (external). Inside snap ring components come in a few sizes for automotive applications and are found in older GM, Chevrolet, Dodge products, and some imports. Outside snap rings are common on many light-truck and performance driveshaft applications. Vehicles that see heavy off-road use should use an internal or full-circle snap ring for maximum retention security. When sourcing a replacement, always verify the snap ring style, series, and diameter to ensure a correct fit in your specific yoke and U-joint combination.

Universal Joint Snap Rings for Racing Applications

In high-performance and racing environments, the integrity of every driveline component — including the humble snap ring — is paramount. Since 1985, BERT Transmission has manufactured some of the top late model and modified oval track performance racing transmissions available. Bert Transmissions manufactures a complete line of drivetrain components for the racing industry, and their U-joint snap rings are purpose-built to hold up under the extreme torque and vibration loads found on the race track. Browse Bert Transmissions Universal Joint Snap Rings for race-ready driveline hardware engineered to perform lap after lap.