using boost to reference load on the motor in this fashion is horrible reference. just because its only getting to 35 psi doesn't mean theres no load, as well as you hitting 55psi in 4th, air is just building up cause theres no were for it to go(low rpm). boost is just a measure of restriction. unless you have 1300hp, that's a pretty steep gear. imo, I would regear to 4.88 and run direct unless its sandy soil, then that a whole another story. ultimately its what you want, and your pocket book can do. the best way it was explained to me, and at the time didn't make much sense, but in order to go faster, you need to go slower
Very good point sir.
Has anyone tried pulling in 4hi 1st gear?