Hey guys. I honestly can say that I did try and search, but I am a little tired and couldn't find anything cause, well, most likely due to laziness.

I don't know if I should say that my rear end is going out, because, well, I don't seem to feel anything different about the truck. Then again, I never drove the truck before the rear end started making the noise. The only way I can describe it is hollow and only increases in volumn with speed. When I say hollow, I mean like a moaning sound a "ghost" might make. I am honestly no mechanic, so I took the liberty of taking a video for those that may be more mechanically inclined.

http://www.youtube.com/watch?v=9Z3YhPV2UHc

Note that there is a moaning noise that does not really follow the same notes as the RPM's. Rather, it seems more to be increase with speed and seems to not really get any higher of a pitch.

In the video, the max speed I went was about 45. It seems to me the noise is worse at about 35 to 70, especially when the RPM's of the truck is sitting at about 2000, which I find weird as I have said several times, the noise doesn't really follow the RPM's.

Anyway, if any of you could maybe help me out, I would be greatly appreciated.

 

Yep, sounds like the ring and pinion is toast. Bein' a 4x4 the rear has probably had some water in it at one time or another, or run dry due to a leaky seal.
The nut that holds the yoke to the pinion can back off also, wiping out the gears. A bearing will raise hell all the time, loaded or not. The gears have worn on the drive side of the teeth, hence when you let off the gas the noise quits.
Installing new gears/bearings takes some experience,so a bone yard rear end would be your best bet.

 

Alright, thank you.

Oh, and by the way, I apologize for putting this in the wrong section, as my trucks a 95. It was late when I posted and I wasn't paying that much attention.

So if you need to move it, go for it.

Last question is how long will the rear end last before I actually should replace it? I was layed off recently, so I am pretty broke. I will get it fixed soon, though, I just can't yet, and I may have to drive the truck too.

 

Your guess is as good as the next person on how long it will last. The 9.25 is notorious for making noises but still holding together. If it were me, id pull the cover off and have a look.

 

As a minimum, change the fluid and ensure it's filled to the correct level, but it's better and should last a bit longer then if you do nothing. Be aware though, if you persist to drive it and it goes out, it may do so at the worst possible time and could cause a bad acident.

 

While on topic. What is a good POSI TRAC rear end to get for a d-150

 

A stock posi unit. Inexpensive and rebuildable.