The information I have from a couple of different sources is for Troopers getting the ring upgrade is mid-year 2001...don't know about other models.
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I researched the same issue last year. I am (and at least one other) are going with an entire driveline swap. LS1/Chevy parts are cheaper and easier to find. Just my two cents...
Sam
Ya that's what I was thinking about, but I think I'd go with the LM4, aluminum block still to save weight but doesn't bring NEAR the money the LS1 engines still do lol. I'm thinking about a 5.3/4L60E combo with a Dana 300 off the back.