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So.....I was lied to then. 01 possibly, but not an 02. I gotta get my hands on that paperwork!!That was a '99 and '00 thing. '01+ got aluminum heads. I think that may also the changeover year for the thinner crank flange, thus the advent of the crank spacer to make up for the thinner flange for the newer motor being mated to the older style 4L80E as with the earlier HD trucks.
So.....I was lied to then. 01 possibly, but not an 02. I gotta get my hands on that paperwork!!