Things You'll Need
Instructions
Insert the memory card that contains your "Gran Turismo 4" save data into slot one of your PlayStation 2. If your "Gran Turismo 3" or "Gran Turismo 4: Prologue" data is on a different memory card, insert that card into slot two.
Start "Gran Turismo 4."
Select "Gran Turismo Mode" from the main menu. Navigate to the Home icon and press the X button. Navigate to and select the "Status" option.
Press "Start," then select "OK" to begin transferring data. If your "Gran Turismo 3" or "Gran Turismo 4: Prologue" save data is not on the memory card in slot one, the game will say so and ask you to select the memory card in slot two. Your licenses will be transferred first. When this is done, select "OK."
Select "OK" once more to begin transferring your credits -- up to 100,000. If the transfer was successful, your A and B license icons will illuminate, eliminating your need to pass those license tests again, and you will have additional credits.