Just jack one wheel off the ground, put the trans or transfercase in neutral, and turn the one wheel - and see how many turns it goes to make the driveshaft turn once. Very easy to do.
If the wheel turns 1.8 revs to the driveshat turning once - it's a 3.73 ratio.
It if the wheel turns 1 3/4, it's a 3.42 ratio.
If the wheel turns 1 1/2 turns, it's a 3.08 ratio.
Note that if one wheel won't turn on it's own, you've probably got a posi-rear and you'll have to get both in the air. Also the math is different.
If both rear wheels turn together: Wheel turns 3.7 turns to the driveshaft once - 3.73 ratio.
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