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Couple things...Its an 07, so its an emissions diesel, and really the first year for them.
Even though it's an '07, it still has the 5.9 so there aren't any emissions on it to worry about. That didn't start until they changed over to the 6.7 engines.

Two, its got the steeper 3.73 gears...
3.73's and 4.10's are the only options for a diesel starting in '03. You can't get 3.55's anymore like you could with the 2nd generation trucks.

Three, its an auto...
The 48RE's really aren't that bad. I prefer them over the G56 transmission any day. If you leave the power level stock you probably won't have many issues. If you are going to turn it up then you will need to look at upgrading it or it won't last long.