While driving jeepand slowing down for any reason loud humming noise comes from engine as soon as you lift your foot off accelerator
Check fluid in rearend.
SOURCE: loud whistling noise while driving.
There was a tech service message to move the luggage racks to behind the rear door, if your noise is from wind this should solve the problem
SOURCE: 99 Jeep Grand Cherokee rear end humming
check the differential fluid in the rear differential. if the fluid is low, add fluid and see if the noise is still there, if the fluid level is ok see if the fluid appears metallic, if it is metallic looking or excessively thick it would be a good idea to have the bearings checked out. i am in the process of rebuilding a front differential on a 98 jeep grand cherokee for the same problem. the bearings inside the differential on the carrier and pinion gear were worn out causing a humming noise. if the wear is excessive the gears might also need to be replaced
SOURCE: 99 Grand Cherokee loud lifters 4.0 engine
You could try running a flush chemical in the engine oil just prior to changing the oil, and then using synthetic oil. This may free up the little tiny valve in the lifters and reduce the noise. At the very least, it will help prolong their life. It is a very big expensive job to change these because they are generally replaced as a set and they are not cheap, but replacement is often the only true fix. Running synthetic oil may seem expensive, but it is far better and you can extend you service intervals so it really doesn't cost that much more.
SOURCE: There is a loud noise at 45mph.
Find a quiet empty stretch of road. Go 50 mph, put the trans in NEUTRAL and shut the engine. If noise is still there, swing car left and right to detect noise differences. Could be hub or axle bearings. Not engine or trans if noise is still there. Hope this helps
SOURCE: 2006 Dodge Gr. Caravan. Loud humming noise upon
Misalignment of the belt, incorrect belt, worn or loose tensioner, Too tight of an adjustment (many service centers do this on purpose so when the belt breaks in it becomes properly adjusted, I do not believe in this philosophy), The belt is actually one long belt called a serpentine belt.....
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