| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,049 Posts1,055,661 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!
| | THANKS!
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: Dec 2010 Posts: 62 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 62 | '56 GMC F350. I really don't know much about 2 speed rears. There's a switch in the dash with pipes coming off the back. 2 go straight thru the firewall and to the axle but the 3rd, which is smaller in diameter, heads under the dash and has a cap on it. Should that one be connected to a vacuum somewhere? maybe manifold? | | | | | Joined: Feb 2004 Posts: 29,767 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,767 | That one is supposed to power a vacuum-shifted gearbox somewhere in the speedometer cable housing or maybe on the back of the speedometer head to change the ratio so the speedo is accurate in both rear end ratios.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | There should also be a vacuum line to the vacuum source and there could also be a port for fresh air coming off of the air cleaner if I remember correctly. Mike B  | | | | | Joined: Dec 2010 Posts: 62 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 62 | Thanks, I'll look at what I have and see if I can figure it out | | |
|
|
| |
