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Vacuum to axle shift motor

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Old 10-25-2011, 09:30 PM
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Default Vacuum to axle shift motor

Alright, so I've searched up and down for a vacuum line diagram for a 5.9L V8 RAM 1500 4x4, and have come up empty-handed. Here's the deal: I was looking into the engine bay, and saw that there is a hose coming from the axle shift motor, but it isn't connected to anything; it just has a coupler at the end of it where it's attached to the frame of the truck. I can only assume it's a vacuum line because it's not leaking any fluid. However, I can't find where that line should be drawing vacuum from, which means that I have a vacuum leak somewhere. I looked all over the place for the other half of that line and can't find anything. Here are a couple of pictures to hopefully illustrate, and yes, I am aware that my axle is leaking.


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Old 10-25-2011, 09:53 PM
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its just the axle breather tube. has nothing to do with vacuum.
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Old 10-25-2011, 09:56 PM
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Quote:
Originally Posted by redneck_ram View Post
its just the axle breather tube. has nothing to do with vacuum.
so, it's supposed to be open-ended like that?
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Old 10-25-2011, 09:58 PM
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I cant really tell by the pictures, but is the line on top? And is it not the breather vent tube?
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Old 10-25-2011, 10:05 PM
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That's the breather hose. The two smaller lines below it are for the vacuum and they go up to the pass. side frame and goes back to a plug on top the transfer case.
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Old 10-25-2011, 10:47 PM
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Should that breather tube be facing downward to keep water from getting in the axle tube, then?
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Old 10-25-2011, 10:53 PM
chadhager03 chadhager03 is offline
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It has (or should) have a little plastic cap on top to prevent water from going in there.
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Old 11-01-2011, 07:45 PM
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On a related note - as you saw from the pictures I posted, my front axle leaks at the shift motor, and recently (as of about two weeks ago) ive been hearing a pretty noticeable humming sound coming from somewhere around the front axle. I'm running 315/75r16 kumhos and they're about ready to be retired, so I'm having trouble identifying whether the humming is coming from the tires or the differential. I guess the question is: even if the diff is low on fluid, would it hum if the front gears aren't engaged? I don't want the thing to lock up on me going down the road, and I haven't been able to find the time to fix that leak. Any input would be greatly appreciated.
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Old 11-01-2011, 08:00 PM
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How about just checking the fluid level and adding once a week? Until you can get to fixing the leak. Or are you just going to let it run dry and wonder where the humming is coming from?
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Old 11-01-2011, 08:57 PM
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To replace that shift cover gasket only takes about twice as long as it does to top off the fluid
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