Just changed the gear oil in my differential. It is a Dana 60, 4:10 gear ratio with Sure Trac. During the project I rotated the driver side rear wheel forward, and the p***enger side rear wheel matched it. During the full rotation, I noticed it took considerable effort to rotate the tire, then it freed up for the final part of the rotation. I completed the service and took the 1964 Sport Fury 426 wedge, hemi 4 speed for a test drive. The car performed just fine, no issues. Prior to the service, it was a bit low on oil, as the ****er Logo Rubber plug in the diff cover was leaking a bit. Fixed that, no leaks. Thanks in advance.