Re: 1970 C10 Trans Issue after distributor upgrade
You probably have a vacuum "tree" fitting on the intake manifold behind the carburetor. It connects there. It uses a short piece of rubber hose to connect to a metal line, and that metal line goes down to the side the transmission, where another short rubber hose connects to the transmission. I'm going from memory here, and I'm sure others will chime in if I have a detail wrong.
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