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Henderson, Minnesota | Take the 2 hoses off the rear axle. With caution for your safety, have someone start the truck in neutral. Hold a finger over each vacuum hose at the same time. You should feel suction from one of them. Have the person in the cab move the shifter button to the other position. You should be able to feel the suction move from one hose to the other. If it doesn't, the rubber valves in the control need replacement. If you feel the change in vacuum when you shift, then it's the diaphragm or something else in the rear end mechanism. I would bet on the rubbers in the valve alongside the transmission, or possibly a leak somewhere. | |
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Please help me to repair vacumn operated 2 speed axle on 77 C-60
