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Mod | | | Forums66 Topics128,042 Posts1,055,519 Members48,424 | | 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
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Sep 2015 Posts: 4 New Guy | | New Guy Joined: Sep 2015 Posts: 4 | Hi all, I just became proud owner of a '51 6400. In decent shape, will post pics soon as I figure out how to. In mean time, my first question is for the vacuum two speed rearend, the selector is a On the dash for the 2 speed. any way to move this to shifter like more modern 2 speed setups?
Thanks and look forward to learning and putting my truck on road again. | | | | | Joined: Nov 2010 Posts: 430 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 430 | Welcome to the bolt Huffy. Lots of good information and great people on this forum. Hopefully someone will chime in on the selector switch. All three of my big bolts are single speed rear ends, so I won't be a big help there...
Good luck with your project. Also there is not a way to upload a picture to this site. You best bet is to upload them to someplace like photo bucket and post a link to that page.
| | | | | Joined: Jul 2014 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2014 Posts: 48 | I recently made the post for "Vacuum switch rebuild" and will be assembling it in the next couple days. I'll post my results. Hopefully someone else who has already done it will respond about shift speed and precision. | | | | | Joined: Sep 2015 Posts: 4 New Guy | | New Guy Joined: Sep 2015 Posts: 4 | I saw your post ..thank you will definitely keep up with that info | | | | | Joined: Sep 2015 Posts: 4 New Guy | | New Guy Joined: Sep 2015 Posts: 4 | ok please let me know if this whole link to picture thing works  https://onedrive.live.com/redir?resid=58EEA391E59D0FF0!807&authkey=!AMced2uJtjvoRNE&ithint=folder%2c | | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | Welcome to the Stovebolt  Your link worked for me! Nice truck, what are your plans? The 55 and up trucks with 2-speed rears had the vacuum switch mounted on the drivers side of the transmission with a push/pull control cable going up the gear shift lever. Mike B  | | | | | Joined: Sep 2015 Posts: 4 New Guy | | New Guy Joined: Sep 2015 Posts: 4 | My plan is to turn it into a shop truck, Mount my welder and such on it. So want to keep truck stock, but reliable. Thinking light sanding and clear coat , don't need fancy paint for gravel raids and welding ? So will definitely be looking for help as I move forward. | | | | | Joined: Jul 2014 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2014 Posts: 48 | That's the vacuum switch I'm changing to electric because it only works 1 out of 4 times I operate it. If I can fight through the dirt enough to actually remove it, I'll post pics. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | There is something to be said for keeping it all original, even though it is a pain to reach up on the panel every time one wants to shift.
Hoses leaking might the reason for intermittent operation.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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