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I have A 89 Toyota pickup 4x4 manual transmission  22re.  This started last year when it was cold outside.  When I'm going down the road it makes a roaring noise.  Cant pinpoint where it's coming from. But I think it may be towards the rear of the truck. it used to do it for just a few miles then quit On and off. If I hit a bump it would quit.  When the weather warmed it quit completely but now it's getting cold again.  It started out the same on and off and would quit, then it got more frequent for longer periods  but today when I was driving home from work it was constant and very loud.  It only does it when cold.  help!  Any ideas

Answer
Hello, while the noise is there take the truck out of gear and let it coast, if the noise stays the same the problem is most likely a rear ale bearing, if the noise goes away it's probably a transmission bearing or differential bearing, if the noise goes away in only fourth gear the problem is the transmission, if the noise never goes away no matter what it's in the final drive(differential).  

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Ted Ritter

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I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for more ten years an have answered over 16,000 questions helping Toyota owners with their problems and save thousands of dollars without any compensation, some of my answers are published on many other websites including google and various automotive forums. DONATIONS ARE VERY MUCH APPRECIATED, IF YOU HAVE RECIEVED HELPFUL INFORMATION PLEASE MAKE A DONATION. AS OF TODAY (JULY 22, 2014) ALL REQUESTED GRAPHICS, ILLUSTRATIONS, DIAGRAMS, PHOTOS, WILL REQUIRE THE MINUMUM DONATION UP FRONT.

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