Instead of having to change your gear ratio I would swap you my 17"s for your 20"s they are 2004 chrome 17"s wrapped in R265/75-r17 Wrangler SRA's with 5000 miles on them. Live in Cen Tex but can travel to New Mexico/southern Oklahoma. wheels are on my daily driver so shipping is a no no.
Pm me or email scott_summers38@us.army.mil