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Click on image for the lowdown. 
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| | | Forums66 Topics128,090 Posts1,056,016 Members48,430 | | 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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2011 Posts: 154 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 154 | Preparing to re-wire my 55.2 gmc 100 with a 350. Pulled this thing out of the dash, it was to the left of the steering wheel. Nothing was attached to it behind the dash. The button does press in. Appears to be some sort of vacuum device? https://flic.kr/p/rDSk5Lhttps://flic.kr/p/sjiyvG
1955 GMC 100 Series 2
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | It has to be vacuum. Maybe it once had a wolf whistle or something like that. | | |
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