I have a 1993 Ford Truck Ranger 4WD 3.0L MFI that is making noise when I get up to the speed of 60 MPH. It sounds like a Hum/Whine sound coming from the truck. I just replace the U joints that bolt to the transmission. What can be going wrong? I drive 600 miles twice a week, need to find out what is wrong with it so I'm not setting on the side of the road. Thanks for your help.

 

I would start by checking the rear end lube level. Examine the fluid also and see if it is black and nasty.

 

what kind of lube do i need for it? Do you mean the pumpin?

 

Could it be the front wheel bearing? If so are they hard to change?
Thank You