I"ve pulled in Hi range since last year and its the only way to go. Are biggest hold back is not having a manual valve body or something to lock the allison in 2nd. I've tried everything I could including using a tech 2 and putting it in 2nd but no luck. There is not a shortage of power but without the extra wheel speed of 2nd we are not going to beat the "big boy cummins"( the very unstreetable ones) all the rest are easy.
I've been stacking the quad215 and hot juice (level 2) with no problem. We just need more speed. I am going to spend some time on the phone in the next couple of days with some of the tranny builders to look for help.