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I have a 2000 with similar issue except I caught my problem before irreperable. My ford stealership advised my the same box was used in the 00-01 Taures... matbe Sable too? Just an FYI for future use.
Try Subwaytruckparts in Sacramento, Ca. They list 4 2000 Excursions on their website
I live in Sac...if you need someone to go over there and ask around, let me know. I have a few interior X parts I need, so it's nothing to check for someone else as well. Not often you find 4 Xs in one yard!
EDIT - The site shows 3 in the yard:
2005 XLT 5.4
2000 Limited 6.8 w/4R100 RWD
2000 XLT 5.4 w/4R100 RWD