tunnel ram update

Stall is 2400. Tires 26in. 3.55 gears. rpm drops to about 4000 rpm when shift at 6600. I have a 4000 stall I'm going to try when I have time this should help with the rpm drop on the gear change. In my race car I have a 5000 stall and shift at 6500 and tach never gets below 5400 on the shift. Does this sound like this should help?