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Click on image for the lowdown. 
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| | | Forums66 Topics128,077 Posts1,055,928 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: Jun 2010 Posts: 3 New Guy | | New Guy Joined: Jun 2010 Posts: 3 | anybody know what the small gearbox attached to the speedo cable under the dash of my gmc is for?it has a vacuum line attached to a diaphragm and it looks to control the speedo but i dunno what its for. | | |
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