Trans gear ratios in each box
722.4 (current trans)= (1st/2nd/3rd/4th) 4.25/2.40/1.48/1
722.5= 3.87/2.24/1.44/1/.75
722.6= 3.93/2.41/1.49/1/.83
You can see the large drop in the 722.4 gearbox from 1st to second is what kills us in lag. The 722.6 box has a great close ratio.