My C-10 makes a monotonously uniform squeak-like noise -" Er Er.. Er Er.. Er Er" ,about every other time it is driven. My first guess was the wheel bearings, but my attention soon shifted. The noise comes from directly under the center of the truck, and only while in gear.(1st gear on a small farm road makes the noise obvious due to the regulation of the monotone sound of the squeak), I was out working with the former owner recently and he suspected a loose or worn "Universal" underneath.
Any help, suggestions, possibilities, guesses, anything would be great.