Rear differential suggestions

[Missyblue]

Thanks for the advice! I'll definitely check out the calculator....
Roger55 sorry if this is a silly question but what is the reasoning for a 60' s rear over the original if they can alter great ratios?? Easier to find parts or can the original not be geared the right way?
Driver_WT I have only spoken to one build guy in my town, have several others to interview,
so far but he encouraged me to stay away from suv rear ends saying he finds them more problematic and week. But you have good luck with the Ford?? I understand their are thousands of opinions so curious of your experience....
Thankjs again!