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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The lower hole has several uses, depending on model. It's primarily used for vacuum valves with either the hydravac power assist brake or the 2 speed axle option on Conventional cab models.
The upper hole is for the cable for the option overdrive transmission.
Bill Burmeister
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