1. Safety First!
* Secure the vehicle: Use jack stands and chocks to ensure the van is stable and won't roll. Never work under a vehicle supported only by a jack.
* Disconnect the battery: This prevents accidental shorts and electrical hazards.
* Wear safety glasses and gloves: Protect yourself from flying debris and potential cuts.
2. Access the Carrier Bearing:
* Locate the bearing: It's typically located in the driveshaft, midway between the transmission and the differential. You'll likely need to access it from underneath the van.
* Inspect the area: Familiarize yourself with the surrounding components, especially the driveshaft, exhaust system, and fuel lines. Take photos before you start disconnecting anything to aid in reassembly.
3. Disconnect the Driveshaft:
* Support the driveshaft: Use jack stands or a suitable support to prevent it from dropping when you disconnect it.
* Remove the driveshaft: This usually involves removing the bolts connecting the driveshaft to the transmission and the differential. You may need a driveshaft support tool to keep the driveshaft from binding during removal. Note: The driveshaft can be heavy; enlist a helper if needed.
4. Remove the Carrier Bearing:
* Inspect the carrier bearing mounting: This is usually a simple strap-type clamp or a more complex housing. The method for removing the bearing will depend on this.
* Remove the mounting bolts: Carefully remove any bolts securing the carrier bearing to the vehicle frame or crossmember.
* Remove the bearing: Once the bolts are removed, carefully slide or pry the carrier bearing off its mounting. It might be stuck due to rust or age; use penetrating oil and a pry bar or suitable tool to help break it free. Be mindful of not damaging the surrounding components.
5. Reassembly:
The reassembly process is the reverse of removal. Remember to properly torque all bolts to the manufacturer's specifications.
Important Considerations:
* Driveshaft Balance: If you remove the driveshaft, it's highly recommended to have it professionally balanced afterward to prevent vibrations. An unbalanced driveshaft can cause damage to other components.
* Workshop Manual: A factory service manual for your specific 1989 Chevy three-quarter ton van is invaluable. It will have detailed diagrams, torque specifications, and step-by-step instructions. You can often find these manuals online or through automotive parts stores.
* Professional Help: If you're uncomfortable with any part of this process, it's always best to consult a qualified mechanic. This is especially true if you lack experience working on vehicles.
This is a general overview. The specific steps might vary slightly based on your van's configuration. Always prioritize safety and consult a repair manual for detailed, vehicle-specific instructions. Failing to do so could lead to injury or damage to your vehicle.
