It is technically called a bridge, not an upgrade. If you use the ticket at the gate before you go to GS, they will bridge the price you paid to the gate price, and then charge you the difference between the gate price tickets. It should be $35 + tax (approx $37.28) to go from a 3 day base ticket to a 4 day base ticket, or a 3 day wpfm to a 4 day wpfm, or a 3 day wpfm + hopper to a 4 day wpfm + hopper. Interestingly, it is $49 for 3 day hopper to 4 day hopper.
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