Taller gear should raise the converter's stall speed a bit.
Whether the car wants that is hard to tell from here with the info so far.
Flash rpm yes, stall no. Rear gear has no effect on stall and it really only changes flash rpm because of how flash rpm is defined, not a “real” change to the actual flash rpm. The change is the car just moves easier/sooner. So yes the rpm will be lower when the car first moves, but you can still get to the power band quicker during the run. (The reason we play with flash in the first place)I went with a low gear set 904 which would “lower” my flash rpm, but because the car is moving, I would get to peak torque .5 second quicker in the run, even with the “reduced” flash rpm.
