this, check with Ty he may have what you need laying around. I would not do anything lower than 3.0 with the rocks. the option for 4.0 with a doubler would be my choice. When you were in my rig the other day, you were in 2.72 with 5.29s and 39.5s. I would think a 205 and 49s with rocks would be pretty close. if I am trying to hill shoot then I have to let my trannie shift to second for the wheel speed. if I stay in first its a no go.
very seldom do i pull the doubler in, but it has made difference in makeing a spot and being denied.