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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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| | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | All three of the trucks I have with two speed rears are vacuum shift but they are not on the dash the valves are under the truck next to the transmission and controlled with a knob and cable on the shifter. Both the 56 and the 57 shift the speedometer with vacuum the 64 shifts the speedometer electrically so its knob and cable also has a switch built in for the speedometer. and my friend has a 72 that has the same rear end as my three trucks so the vacuum shifted rears were around till at least 72.
I haven’t seen the internals of the dash mounted valve but I bet you can rebuild it with standard o-rings and seals try and industrial outlet like Seal Source some of the bearing outlets also have a good selection of seals and o-rings. If you have a local industrial hydraulics shop you may check with them if they can’t help they should be able to direct you to someone who can. | | |
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