[Christ]

You can get a 3.55 from an Explorer with LSD and discs. There's 3.55 as a pretty standard ratio in almost everything. 3.07 is also readily available in many vehicles. You can also go for as low as a 2.73 in Ford 8.8".

Anything that you want to put under your tracker will prob have to be shortened. There are also a few other IRS style rears with different gearing as well that will be lighter than a live axle.

I think the power of a 2.2 is prob excessive for what you need unless you plan on going 75-80 everywhere all the time. The tracker isn't terribly heavy, but there is a lot of excess weight in it that can easily be swapped for lighter parts, especially if you're not keeping the 4x4.