Help me understand doubler ratios

[ecgreen]

Thinking of putting an Atlas 4 in my truck, but I might try my hand at building a doubler since I have most of the stuff laying around and I have the skills (and access to people with more skills than me) to get it done. So I am assuming you can shift the main transfer case and get 2.48:1. Then you can shift the planetary in gear I am guessing. How do you calculate the final ratio from there? 2.48+2.48 or is it 2.48*2.48? School me please.

 

[Roert42]

Trans gear ratio x transfer case gear ratio x doubler gear ratio x differential gear ratio

 

[Roert42]

Every set of additional gears you add you are multiplying the last set of gears by the next one.

 

[ecgreen]

Every set of additional gears you add you are multiplying the last set of gears by the next one.

Thanks!