From my experience that rolling off thing is not true of the vacuum two speed in the vintage of Chevy truck that you have. As you have confirmed it takes vacuum to shift to hi or lo as noted by your test of the lines and the vacuum swapping from one to the other. I have been around a handful of Chevy trucks with vacuum two speed axles from the sixties and never heard of this being an issue. This may have been true of an axle with a different design where vacuum made the shift to hi or lo, but a spring returned it to the opposite speed. As far as having a good emergency brake if there was a disconnect in the rear axle it would not help anyway because the emergency brake on those trucks is on the back of the transmission and locks the driveshaft from turning. Wheel chocks would work in any case.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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