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.
Just for info, rear gear changes did have an effect on stall speed on my combo, verified by the racepak.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
| 
