Base model v6 rear end noise above 50 mph new rear end an u mount still noisy
Check the "u" joints and check that the drive shaft flanges have been properly fitted to the pinion flange or that the "u"joints have been properly fitted into the pinion "ears " of the pinion.. Check that the correct grade of oil was used in the diff and it has the correct amount. New out of the factory diff should not be noisy but if you have a new rebuilt diff then it is possible that the gear mesh is not correct or used gears were used where the best mesh was obtained.
SOURCE: 2005 V6 Mustang
check for fuel, spark and compression. these are the only things needed for a engine to run
SOURCE: 1999 ford windstar stalls at 30 to 50 mph when at
you should check the all vacuum hoses starting at the egr valve. if the vaccum hoses are soft they will collapse and stall the van.
SOURCE: speedometer needle fluctuates above 50 mph and
you probably need to replace the cable or the speedo
SOURCE: Symptoms of rear wheel bearing failure on a 1999?
It could be a bearing going out, depends on the noise, but I wouldn't start changing right away. You also have braking components back there. Identify which side it is coming from and eliminate the possibility of a brake issue before you begin the task of bearing replacement. Just makes good sense! Good Luck, I hope this is helpful!
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