3680-80 – Center Support Bearing – Gm Application – 1.181″ ID – 1.375″ Center Bearing To Base

The 3680-80 center support bearing supports the midshaft section of a two-piece driveshaft, keeping it running concentric with the vehicle's drivetrain axis. When this bearing fails, the midshaft droops and the driveshaft angles change — you'll feel it as a vibration that gets progressively worse at highway speed. The 3680-80 center support bearing is the correct replacement for GM series applications, with the exact inner diameter and mount hole spacing your application requires.

3680-80 Center Support Bearing — GM Series Dimensions & Mount Specs

The 3680-80 center support bearing specs: 1.181" inner dia | 1.375" center-to-base | 7.500" mount spacing. Pontiac G8. Application: GM series. Inner diameter must match the midshaft stub OD exactly — a loose fit allows the bearing to walk on the shaft, which causes vibration and accelerates wear on both the bearing race and the shaft surface. Mount hole center-to-center spacing must match your crossmember bracket.

When replacing a center support bearing on a two-piece shaft, replace the complete assembly — bearing race, rubber isolator, and bracket together. A new race in an old hardened rubber mount still vibrates. The rubber isolator is what actually absorbs the midshaft movement; without it the bearing transmits every frequency directly to the frame.

Key Features

• Application: GM series — verify your driveshaft series matches
• Bearing inner dia: 1.181" — must match midshaft stub OD exactly
• Center-to-base: 1.375" — height from shaft centerline to mounting surface
• Mount hole spacing: 7.500" — must match crossmember bracket exactly
• Complete assembly — bearing race, rubber isolator, and bracket as one unit
• Rubber isolator included — absorbs midshaft vibration, reduces NVH to frame
• Note: Pontiac G8

Specifications

• SKU: 3680-80
• Brand: UDS
• Application: GM Series
• Bearing ID: 1.181"
• Center to Base: 1.375"
• Mount Hole Spacing: 7.500"
• Notes: Pontiac G8