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This is really spiraling off topic, but I'm loving the conversation. That serial # of 2446xx falls roughly 25,000 units after mine in the serial number range. If my truck rolled off the line in 2005 at 219,638 and that one in 2007 at 2446xx, that matches pretty well with AM General's claim...

Called AM General and they will be calling me back. They should be able to tell me by the serial number or SOMETHING. From their website they say: "More than 280,000 HMMWVs are produced by 2012". My serial # of 219638 might be an indicator of the year even if they can't help. I'm trying to...

So using this data plate as an example, you're saying that it looks like this is a 2005 model year truck? Edited to add that I've confirmed my "2005" M1123 has a Navistar block and it is a GEP 6500 Optimizer:

The odd thing about my truck is that it is a 2005 model year according to the data plate, but the rebuild date on the engine and tranny is 2009. The tires are from 2009 also. So if they replaced the data plate in 2009 during the reset, I'm unsure why it would say a delivery date of 2005...

I always thought that having the GEP motor will depend on which year your truck is and obviously the maintenance history. I fully expect that my 2005 M1123 DOES have a GEP 6.5, I wouldn't expect a 1998 M1123 to have a GEP 6.5 unless it was replaced. For what it's worth... mine has plates glued...