Hello there The GT3 feeling is great with the last update but we need to have the possibility to modify the gearing ratio... I don't understand why it's forbidden. For example, I can't be competitive with the Audi R8 LMS on Redbull Ring, 'cause I can't pass my 6th gear, and I can't take some turns properly (turn 1, 2, 3, 7 and 8 'cause of the bad ratio on this track *sigh*). C'mon, it's a "must have" feature! Sincerly
As @rad said, locked ratios are part of the performance balancing. You'll just have to get used to the fact that some cars suit certain tracks better than others...just like real GT3 racing!