We are the original owners of a 5 speed, 1993 Ranger pick-up with 140000 miles. Within the last week it has developed a high-pitched whine in the rear end while driving, and this is in all the gears. Any suggestions on what this might be? Thanks

 

a bearing in the rear end wheel bearing maybe.

 

Does it make more noise when applying power and less when decelerating. If it does, I would say pinion bearings. If constant may be wheel bearing.