2003 Dodge Dakota 2wd 5 speed standard transmission. Stack rear end was an 8 1/4 with 3.55. Changed to a 9 1/4 with 3.92 from a 2002 Durango. Had to add shock mounts, and instead of the flat plate at the end of the drive shaft that bolts to the diff. It has the two caps that bolt the rear U-Joint to the diff yoke. Here is the issue, when barely pressing gas pedal or when pushing the clutch in, I hear a noise that sounds like it’s co from under the cab. No noise when accelerating or deceleration. Only when clutch is pushed in, or when barely applying gas. When installing the driveshaft to the new differential, I did have to slide the drive shaft toward the differential just a smudge. 1/4” or so. My best guess is that that small movement may have been just enough to introduce a rusted dirty spot into that mid span bearing looking thing. What do you guys think? What the hell is that mid span bearing looking thing?