[1795]

What rpm range do you plan on the power band being in? A 4.88 ratio will raise your rpm's in the tight corners above the 1900 range, but it makes me think that you want to make sure that you are not too much into the power band at that slow of a speed, as you might risk breaking the tires loose with all that power.

It's tough for me to comment, as I have not auto crossed, only road raced and therefore we are approaching our corners differently in some aspects and similar in others. Sounds like an interesting build.