So what would my next step be? So what would my next step be?

Test to see if the yoke as it now is will move up and down at all by hand. In other words, does it have any slop or loose motion. I it essential when you replace the seal that the yoke nut is tightened exactly back to its former position. Did you carefully examine the yoke surface where the seal touches it? Did you install the new seal using an installation tool, or just a piece of pipe and a hammer? If none of this helps, might be time to have a pro (dealer?) take a look. Setting up the correct clearance in a diff requires expensive tools, and sounds as if you may have worn bearings. Test to see if the yoke as it now is will move up and down at all by hand. In other words, does it have any slop or loose motion. I it essential when you replace the seal that the yoke nut is tightened exactly back to its former position. Did you carefully examine the yoke surface where the seal touches it? Did you install the new seal using an installation tool, or just a piece of pipe and a hammer? If none of this helps, might be time to have a pro (dealer?) take a look. Setting up the correct clearance in a diff requires expensive tools, and sounds as if you may have worn bearings.