A833OD inspection results... thoughts?

I would tear it down. You cannot see pitting on the balls/ needle bearings without doing so. If I remember correctly the only special tool you really should have is a "duckbill" snap ring pliers. Unfortunately the original KD set I had are long gone, and the "new replacements" are smaller and don't have as much spread. This is for the big snap ring on the ball bearing between the case halves, in the tail housing.

You don't really need an arbor to reinstall the cluster. I used to put the shaft in the cluster, and stack the needles in from the ends with grease, then carefully pull the shaft out. Last time I did this I actually used a cut length of 5/8"? heater hose for an arbor LOL

You can download factory service manuals from MyMopar