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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!
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| | | | Joined: Jul 2007 Posts: 461 Shop Shark | | Shop Shark Joined: Jul 2007 Posts: 461 | Yes, the single-action pump was standard. If the truck originally had a double-action pump that was replaced with a single-action unit, you should find extra vacuum lines that would have connected to the pump, and probably the wiper motor.
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