3680-12 – Center Support Bearing – Gm Sts (awd) Application – 1.181″ ID – 1.043″ Center Bearing To Base

When working on the GM STS (AWD), the 3680-12 center support bearing is a critical component to ensure proper driveline function. This bearing features a 1.181″ inner diameter, which is essential for maintaining alignment and reducing vibration in your two-piece driveshaft setup. The center-to-base height of 1.043″ is designed to keep the driveshaft operating angle correct, preventing unnecessary wear and tear on your driveline.

Before installation, make sure to check the mounting hole spacing, which measures 6.827″ center-to-center. This ensures that you align the bearing correctly, avoiding any pre-load on the rubber isolator. A common mistake is to tighten the mounting bracket before confirming alignment, which can lead to driveline vibration and premature failure of the bearing.

Here are some key installation tips:

• Verify the 1.181″ ID fits your driveshaft.
• Ensure the center-to-base height of 1.043″ is correct to maintain the driveshaft angle.
• Align the mounting bracket before tightening to prevent pre-loading the rubber isolator.

Watch for symptoms of failure, such as vibration at highway speeds or bearing noise, which can indicate a deteriorating rubber isolator. Remember, the 3680-12 is designed specifically for the GM STS (AWD) application, so using the correct part is crucial for optimal performance.