just a tish NE of central ND | Tom Graham - 12/4/2010 09:07
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.
Also if there is a hole in the shifter diaphram, the (gas only )engine probably wont run like it should because it is sucking vacuum where it shouldnt be throwing the engine gas/ air mixtur off. It if is running poorly, you can idle the truck and kink or squash a hose near the rear axle to block its air flow. (or remove and plug lines)if it makes the engine change the way it sounds you most likely have a air leak hole in the shifter diaphram... Which is a 4 or 5 inch black rubber disc in a cansiter on 2 speed of the rear axle. Unbolt it, disasemble and clean and replace the rubber.Its a spendy little item of about 55$ for that peice of rubber, but it wont work without it and not many places have them on stock. I got mine out of Inland truck parts in Bismarck ND.....Only one I could find in well over a hudreds of mile radius.
Edited by School Of Hard Knock 12/4/2010 10:42
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Please help me to repair vacumn operated 2 speed axle on 77 C-60
