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...1 - Why do they say, if necessary replace the wheel pin (I take it they mean wheel lug nut studs) - why would this be need to be done?

isuzu wheel studs are known for getting stripped. some say it's because of the fine thread and the heavy handed use of pneumatic tools. in any case, now's the time to replace them (if they need it) while you have everything off. if you can't turn your lug nuts on and off by hand (after they are loose), and they won't clean up with a thread chaser or die, then you should consider replacing the studs (and maybe the lug nuts too). be warned: they are not cheap.
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4 - At 130K miles, should I just get new bearings instead of reusing the old? ...
replace *if* necessary, which will come from inspection. metal shavings, specks; heat coloration of the races or bearing; galling or other problems with the races; etc all would indicate replacing. otherwise they should be good. if you are concerned, you might want to have them on hand. i personally like to replace both sides at the same time, even if only one side *needs* to be replaced.
this timken bearing site has some good info for the novice bearing inspector/replacer
http://www.timken.com/industries/automotive/autoaftermarket/index.asp
click on Automotive TECH TIPS.




//bc

1992 sohc trooper 3.2l v6 automatic . . . as is

i love a good intermittent electrical challenge. . .especially when it's someone else's.