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| | | Forums66 Topics128,175 Posts1,057,052 Members48,460 | | Most Online14,466
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: Aug 2020 Posts: 2 Moderated | | Moderated Joined: Aug 2020 Posts: 2 | I need to replace the frame hydrovac on my 1962 GMC 4000. I have vacuum at all times through the breather vent behind the seat. The tag number on my hydrovac shows C-4012-E.
I cannot find a rebuilt unit or any cross reference to replace my hydrovac. Does anyone know of a cross reference number or where I can send my hydrovac to get it rebuilt?
Any help would be appreciated.
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