Howling rear differential?


Old 01-22-02, 06:41 PM
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Question Howling rear differential?

RE: I have a 1990 Dodge Ram 3/4 ton truck and I noticed a howling sound that seemed to come from the rear end last night. Truck was cold (-20 Celcius)and very noticeable. Sound gradually reduced at highway speeds. This morning I checked the oil level and no oil leaked out when the plug was removed, I added about 1/3 of a litre of proper oil and went for a ride. Noise wasn't as loud but the heated garage may have been the reason for this. I took the truck to highway speeds for a couple of miles and returned home. There seems to be a slight noise yet. I not sure what type of differential it is (not posi) but it has a 360 automatic , if that helps. Is the rear end shot? I thought the noise should increase as speed increased.
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Old 01-23-02, 11:02 AM
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If it was run low on fluid, it may have contributed to wiping out the bearings in the rear.

What fluid are you using? Might be time for a change.

Take your wheels off. See any grease or oil leaking from the seals behind the brakes?
Old 02-05-02, 10:23 PM
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center support bearing

I spoke to a mechanic regarding the sound that I originally believed came from the rear differential. He asked if I had a 2 piece driveshaft. When I said yes, he said that the center support bearing was the likely problem. I took a peek under the '90 Dodge 3/4 ton tonight and the rubber seal seems to be faulty. I bought a new bearing and now I'm wondering if I need a puller or if the u-joints need to be removed to replace the bearing. I also noticed a rubber boot adjacent to the bearing. Any help would be appreciated. Thanks.
Old 02-06-02, 06:33 AM
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Get a hold of a repair manual or description to guide you through the repair.

Again, mileage? Might be worth it to change the U-joints while you have it all apart. I would.
Old 02-06-02, 02:55 PM
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I'm thinkin like Joe when those carrier bearings on the drive shaft go it is usually time to replace the u-joints also--not hard or expensive!!

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