1. Gather the necessary tools and materials.
- New muffler with A and B on the ends
- Socket set
- Wrench set
- Pliers
- Screwdriver
- Jack and jack stands
- Safety glasses
- Gloves
2. Prepare the vehicle.
- Park the van on a level surface and apply the parking brake.
- Turn off the engine and allow it to cool down completely.
- Engage the emergency brake.
- Raise the front of the vehicle with the jack and secure it with the jack stands.
- Remove the spare tire, if it is in the way.
3. Remove the old muffler.
- Locate the old muffler.
- Disconnect the exhaust pipes from the muffler by removing the bolts or clamps.
- Remove the old muffler by pulling it out of the exhaust system.
4. Install the new muffler.
- Place the new muffler in position.
- Connect the exhaust pipes to the muffler by inserting the pipes into the A and B ends of the muffler.
- Secure the exhaust pipes to the muffler with the bolts or clamps.
- Double check the bolts and clamps to ensure they are tight enough to prevent exhaust fumes from leaking out.
5. Lower the vehicle.
- Lower the vehicle by using the jack and jack stands.
- Remove the jack stands and spare tire.
6. Test the exhaust system.
- Start the engine and let it run for a few minutes.
- Check for any leaks in the exhaust system.
- If you hear any leaks, tighten the bolts or clamps until the leaks stop.
That's it! You have now successfully installed a new muffler on your 1990 Chevy full-size G20 van.
