Repair Overview for Early 80s Rear Suspension
I’ve noted over a dozen points that you might encounter during a similar repair on early 80s models. My current list only covers the rear suspension—I haven’t even started on the front yet, so expect the notes and insights to expand once I get there. I’m confident it will be interesting.
I’m taking a long 3-hour break during this project, which is a great opportunity for you to follow along. The whole process should take about a week. If you’re planning a similar repair, this thread will be invaluable.
Despite being 37 years old, the rear suspension design has remained unchanged up until 2020. Although it has been reinforced several times, the core design has stayed the same. That’s an impressive 40-year run!
Here’s a breakdown of the process:
Item 1: Air Dryer
AD2 Air Dryer: The AD2 is a vertical cylindrical unit, as seen in the center of the photo. All parts are still available, and it’s very easy to service on the bus. For easier access, remove the rear right tag tire and wheel.
Removing the Base: Start by removing the air line and the wire going to the heating element. Next, take off the 3 ½ inch bolts that hold the three clips (visible in the foreground of the image). Tap on the base with a rubber mallet to drive it up into the housing enough to remove the large snap ring.
Exposing the Cartridge: With the base removed, you’ll expose the cartridge. You’re looking at the base of the dryer while still on the bus. Remove the ¾ inch bolt to pull out the cartridge from the bottom.
Reassembly: After removing the ¾ inch bolt, pull out the cartridge from the bottom. To reinstall, simply reverse the removal process.