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DWrat,
Remember 5th is just a cruise gear. I have a 3.27 rear and the same tranny as you. Once you get used to it and the motor is not lugging 5th is fine. If you need to pass give it some gas or down shift.
I do not remember what my RPM's are for the mph you are talking about but I know it's lower.
If you have to have the tranny gone through then you can change to a .8? fifth.
Mike
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