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The first half of the build year had the 7.3, the second was the 6.0.
I have read on here that there were some problems with the first year of the 6.0. You can browse through that forum and have a look-see.
I have the '03 7.3 and love it. Yes, I've heard that the trannies aren't the best they could be but then again, I don't plan to do any sled pulling at the monster truck show.
the auto up until 2003.5 is the 4R100, a four speed. it would be nice if someone made a kit with a flexplate and other stuff to make a 5R110 *torqueshift*(only found in 6.0's) fit in there.
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