Yep, your VIN sticker on the door should have all the numbers for the axles and such. It should also have the rear axle code. You should also have a tire inflation sticker in the door jam that should note the allowed payload for that vehicle as it was fitted from the factory. Then you have to subtract whatever accessories have been installed since. With the 3.55 gears, I'd assume standard tow package vs. Max Tow. Good thing they have the 5.4 though, makes a good bit more power and torque over the 4.6.
