GMC 4000 rear axle vacuum shift
I have a 2-speed T150 rear axle and a SM420 transmission.
I have to maintenance manual for the subject truck and I don't see anything written regarding to required vacuum pressure that is optimum for shifting the truck. I have traced to vacuum lines and identified where the rubber connectors are to separate and test with a vacuum gauge. I just don't know what the pressure should be.
Picture attached of the T150 rear axle with the shift chamber installation.
Thanks in advance for any information.
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USMC Retired
Pollock, LA.
Own a 1961 GMC 4000 (Fontaine Flatbed) with a 305B engine
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