didnt know there was such thing? didnt know spark plugs has resistors either? but would make sense for this problem i guess...

 

Even if your diff has fluid that doesn't mean its not going to howl or make a high pitch noise. My buddy's XJ does this same thing even though he has fluid in it. Most likely its a bad bearing in the rear end. It will get worse and eventually leave you stranded unless fixed.

Or it could be something else

 

 

That's what the R stands for in the plug type.

 

hhmm... thats bad... worked at nissan and autozone at one point and didnt know that...

 

turn the radio up real loud.....problem solved.

 

 

That noise sounds familiar so here's my .02. Pull the fuse on your stereo, if it goes away, you have a ground loop that is allowing electrical interference from your alternator. When you give it some gas, the speakers, which are low-voltage devices, are picking up the AC flux and making that strange hum at low rpm and whistle at high. This happens a lot with people who have amps or capacitors installed as part of their stereo system because the ground is usually strapped to a convenient point on the chassis, which your alternator is also directly grounded to. You can either redo your wiring to connect the ground to the stock electrical systems or get a ground loop isolator from Radio Shack, which just installs inline with your stereo plugs: http://www.radioshack.com/pwr/produc...-Isolator.html