No your probably really close, but the poster, Isaac, is running a powerglide and his gear ratio is way too high unless he is running 1/8 mile. :wink: With a powerglide he needs more gear. in low gear with a 1.76 glide he has a 8.59 final ratio, you with a th400 have a 12.10 in low gear, then you shift to second and that gives you a 7.22, so imagine you trying to start in 2nd gear, you would have too high a ratio. Not trying tto argue just showing the difference with a powerglide and 3 spd.
I have ran as low as 7.33 gear with a 1.80 planetary, (13.19 final ratio in low) with awesome results on short tracks, but the pinion was too small to handle the power, about 5 passes and it broke.