Just got a 2006 V6 4x4 w/TRD Sport package

Welcome from OR.

 

Your truck has the TRD Offroad wheels, those did not come from the factory on your truck.

 

When I bought the truck the other day, I wasn't aware of the difference in wheel sizes between the two TRD packages. The fact it isn't stock doesn't worry me too much they are definitely Toyota rims, but not sure if there are any mechanical issues with the swap.

 

No mechanical issues, as the brake rotors and calipers are identical between the TRD Off Road and TRD Sport. Your truck can also use FJ Cruiser and 4Runner OEM wheels, but they are all heavy.

When you shop for real all-terrain tires, some of them come in P-metric. They weigh in the 40-lb range instead of the 55-lb range typically seen with LT-spec all-terrain tires (like the BFG All-Terrain KO). Using the lighter P-metric tires will ensure you won't lose any MPG compared to stock.

 

Thanks for the info. I really appreciate it.