front axle seal and howling noise - help

I posted a note last week with a noise problem on my 1994 Ram 1500 4x4. I had a couple of responses that suggested that the REAR differential was going bad. I would like to up date everyone.
As I understand it, its very common for the bearings in the Chrysler rear end to go bad, but as I drive down the road the sound seems to be closer to the front of the truck. Now I can't tell this for sure as I cant hear it very well with the windows open. The other interesting piece of data is the front passenger axle seal went last week. I replaced the seal and within 100 miles I'm blowing a lot (enough to leave a puddle) of oil again . Has anyone had a problem with their front axle that caused both the passenger axle seal to blow oil and a noise? What could be causing both? Here is my original description of the noise............it sounds like a winning, howling sound that seems to increase in pitch with road speed. It's the loudest between 30 - 40 MPH, but can be heard slower and faster. Sort of like tire noise, but I don' think it's the tires. I also replaced both front hubs and axle joints over the summer, about the same time I put tires on. I don't think is the transmission, the noise does not change when I push the clutch IN, put it in different gears or even coast in neutral. The noise doesn't seem to change with load either. I even put the transfer case in neutral and ran the tranny through the gears with no noise. I replaced the rear u-joints and changed the fluid in the transfercase and front differential with no change. Any more ideas?
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Update....... Well I found out why the oil seal was leaking. After pulling the axle out for the second time, I decided to really take my time and look for the bigger issue. Before pulling the axle out, I removed the CAD cover and observed the axles as I rotated the hub. To my surprise I noticed the axle was not turning symmetrically were the intermediate axle met the stub axle. For my discussion, the intermediate axle runs from the CAD to the diff, the stub axle is from the CAD to the U-joint and the outer axle is from the u-joint to the hub. After pulling the axle out I noticed the bushing from the end of the stub axle was gone and the hole worn badly. Upon reassembling, with a new axle, a noticed everything was fine until I tightened the three hub bolts. The hub pressed the axles together so tight they would not turn freely as the CAD. I removed the hub and reinstalled it several time to find no improvement. I now know where the old bushing went. Seeing as the hub was only a few months old, I took it back to AutoZone and got my money back. I then bought a high quality unit from another, more reputable parts store. The hub fit properly with about 1/16inch end clearance between the axles.
The noise is still there but I'm guessing the ground remains of the bushing has done a number on the bearings in the differential. The moral of the story it's not worth the $30 savings by purchasing sub standard parts from AutoZone. I already have $150 into axles and seals and I still have to fix the differential.
P.S. When I took the hub back to AutoZone they said. "Oh there is a hold on that one. I'll give you a refund" Gee I wonder why!!!!
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hockeydad wrote:

What brand of hub gave you problems? What brand did you end up with?
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