Output shaft end play

It's probably worth tearing down and inspecting if there's any question as to condition. I've never used "special tools" but having an undersized arbor to install the cluster needles is DEFINATELY a plus. in "my yuth" I just used grease and my fingers, and maybe failed a couple of times.

But tearing it down will allow you to inspect the interior of the pilot shaft, the nose of the mainshaft, and those needles. Same for cluster shaft and needles. And, you have the two big ball bearings "out" where you can turn them easily and "feel" for roughness as well as see the races and balls.