99-02 have the 4.0 litre and the 03-04 have the 4.6 litre engines. Since the 03 doesn't have CDL the 04 is the choice vehicle. Of the 4.0 litre trucks, the 99, 00 and early 01s have a transfer case with CDL but you have to rig up the linkage to operate it from the cab. Also the 03 and 04 have improved traction control although my reading of the description says it's primarily the on-road, highway speed performance that's improved. The 04 also has an upgraded (read stronger) transfer case. I guess the SLS is an advantage when towing but since I wasn't going to do much towing, I replaced my SLS with springs for off-road reliability reasons.
My $0.02 worth...
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