what i mean is what is the high range reduction for calmini's 6.5:1 and 4.1:1 and rocky-road's 8:1 not in percentages actual reduction #s. what i have is 4.10 gearing in my axles with an OTT doubler and looking to reduce the sami t-case gearing. i am trying to determine weather i can just do that or if i will have to change the r&p also i had a simular post before but can't find it. HEATHER had a good chart and it is lost now. oh i am planning to run 35" to 37" tires. it does will need to be able to run atleast 60 mph.