Your right. The 3.55 is not listed under the accessories/add ons. If you look at the printed brochure, it's listed under mechanicals under subheading 'axle', and their it states that the 3.21 is not available with the 3.0 V6 EcoDiesel... So the 3.55 is automatically substituted.
If you try to 'build' it online, as soon as you select EcoDiesel as the engine option, it automatically opens a window stating that you have to get the 8-speed and 3.55 if I remember right. The only other option is the 3.92.
If you try to 'build' it online, as soon as you select EcoDiesel as the engine option, it automatically opens a window stating that you have to get the 8-speed and 3.55 if I remember right. The only other option is the 3.92.
