Mechanic Glossary

Driveshaft Center Support Bearing

A bearing mounted in a rubber isolation bracket that supports the center of a two-piece driveshaft on long-wheelbase vehicles.

Long vehicles use a two-piece driveshaft to prevent flexing. The center support bearing holds the joint where the two shafts meet. It is bolted to the vehicle frame. The rubber mount absorbs vibrations to keep the passenger cabin quiet.

Heat and aging cause the rubber surrounding the bearing to tear. This allows the driveshaft to sag and wobble. The wobble creates a heavy vibration under your seat when starting from a dead stop.

Frequently Asked Questions

A howling, squealing, or thumping sound directly under the middle of the vehicle, especially when accelerating from a stop.

Heat, age, and exposure to oil leaks rot the rubber. Once the rubber tears, the driveshaft will wobble and shake violently.

Yes. Mark the alignment of the driveshaft sections before disassembly. If you put them back out of phase, it will vibrate.

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