IIRC, the damper is a heavy ring on the yoke (not the shaft) and is situated on rubber (not viscous anything). The rubber usually ends up shrinking and ring comes loose.
I've lost track of which rear driveshaft is on the KJ (not home to check), but I do know the pinion angle is higher than I...
No balancer and I can't measure the angle for 2 weeks.
I do know most of the angle is at the fwd end - almost nothing on the rear. I've never been happy with the arrangement (visually) but it also hasn't given me any trouble.
The mechanical fan itself probably contributes to the pump wear/death. That is the case for the Ford 7.3L powerstroke also (there's a cast iron pump from a Navistar application that lasts much better).
My original KJ pump died abruptly. Gushing coolant and failed bearings. It's replacement...
I'm used to yards that won't let you pull a diff apart. A posi on the shelf often fetches as much as whole rear end.
Watch the ring gear bolt-hole detail (3/8" vs 10mm), or get the r&p also.
Definitely change those!
That's the main cause of the intermediate shaft spline failing.
I found plastic ones in mine, and put in the proper roller needle bearing replacements (Spicer).
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