Originally Posted By: Kestas
I have diff fluid in some of my cars that I know hasn't been changed for at least 10 years.
I never change the diff lube... In '00 when I did a gear swap in my '69 Fairlane to install a highway gear, I drained out the original lube... Wasn't anything wrong with the original gear, just wanted to change ratios... Unless someone changed it prior to me buying it, my '93 Lightning is still running orig gear lube...