How low is too low for gear ratios. I am in the planning stages of a new rig, my 76 FJ40, and plan on using an SM420 tranny(7.05:1) mounted to my stock transfer case(1.992:1). I have 4.10:1 pinion gears. Then I decided to get an AA Rock Box, it has a 3.44:1 reduction. My lowest crawl ratio would be 198:1. Is this too much????? I could use my stock tranny, but i don't know the gear ratios there. Can anyone lead me to the right source for my stock tranny ratios?