Re: What's this?
It may be part of the anti-dieseling solenoid. I believe that 72 trucks had a vacuum pod like this that was connected to the carb and distributor. Power ran from the trans. to the vacuum pod then to the carb solenoid. 72 solenoid had one electrical connection.
71 had a similar setup, but it combined the vacuum on the back of the solenoid. 71 solenoid has two vacuum ports, and two electrical connections.
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Justin
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