2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
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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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.