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Old September 18th, 2020, 04:00 PM
Crosshairs6 Crosshairs6 is offline
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Join Date: Jun 2014
Location: Pollock, Louisiana
Truck: 1961 GMC 4000 (Fontaine flatbed) w/ 305B engine
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Default Re: GMC 4000 rear axle vacuum shift

Thanks James. This same information is in my manual as well. The bench testing procedure for testing the shift chamber is there but it doesn't mention what the standard operating PSI should be with the engine running.
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Own a 1961 GMC 4000 (Fontaine Flatbed) with a 305B engine
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