The Stovebolt Site Forums The Shop Area Driveline Rear diff, what years are the same?

Pictures, measurements and count the gears. Believing they are the same is not good enough. You mean you are running the drive train up on jack stands with the wheels off? the freely/stiff part could be posi. I said could be. Maybe you can run it and feel the axle tube/axle end to see if that area on one side is real hot compared to the other. ALSO very important: use a stethoscope if you have one or a broomstick or conduit pipe and place one end near the axle tube end and listen at the other end of the stick/pipe for noise. Listen at both sides to hear the difference. Also place the stick on the differential cover. You are lucky that it makes noise up on jackstand. Being strapped under the truck while being driven down the road and listening for noise is a nightmare! and muddy and fumes and...