anyone replaced trooper4L30E transmission?

the early 92-95 troopers use the 4L30E transmission, has anyone replaced it or done any maintenance, *other* than replacing transmission filter (done that) and
replacing fluid (done that) ?
if you did anything other than the above two items or replaced it, what was it, what did you do and what was the approx cost of the job/task/part?
am hoping I can locate a couple replacement transmissions, perhaps via ITOG or St Charles Isuzu
here's testing info http://www.zoom-tech.com/downloads/support/tranxpages/asian/Isuzu-4L30E.pdf
did you perhaps replace harness or install a shift kit (aftermarket firmness kit)?
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