gear ratio and other such things

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okay... I have an 85" 60, I'm well aware of the majority of the specs on the H55F trany. Heres my Q:
The over drive on the H55F gives .84 so in other words an RMP that currently runs me at 70MPH will be reduced by 16% right? If i lifted my truck using 2.5 BDS and put 33 inch tires under it. what would my ratio be then? would i get about the same as if i put an h55f in? I hope this question makes sense. I'm sure there is some formula for this but I got out my calculator and couldnt make sense of it. I hope someone understands what im asking. lol
thanks
 

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