After reading this conversation do most trucks have a metal piece of tubing going through the firewall for vacuum hose? I am doing a 37 1/2 ton and was not sure where or what went through the firewall. Any answers to my question?
This is a '38 car so I'm not sure about the translation to a '37 truck but here's how it's routed on my '38. It's the hose just below and left (from driver's position) of the four gang grommet. There's no metal piece through the firewall.
