If your only wanting to go in the 11's just get a proshifted 5 spd of some type. I have driven both c4 fully manual valve body reverse shift pattern with trans brake and air shifter, had a glide at one point, but I always went back to the jerico simply because I wanted to be different and fast with something everyone and their brother doesn’t run. I still have a c4 in our wagon fully manual valve body reverse shift pattern that leaves off a 2 step. Its an alright ride but still not nearly as fun.