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Click on image for the lowdown. 
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| | | Forums66 Topics128,049 Posts1,055,649 Members48,426 | | 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: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | The small vacuum line coming from under the truck was probably connected to the 2-speed rear selector switch located on top of the trans. The other end of this line would be connected to a 2-speed reduction unit located somewhere in the speedometer cable line (maybe mounted directly to the back of the speedometer)...it keeps the speedometer calibrated in both Hi and Lo range. If not used or needed it should be plugged. Mike B  | | |
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