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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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