My TJ on 35s and 4.88 with the 3 speed seems to be right in the middle of your measurements. At 3200 RPM I'm around 68 mph - 3500 RPM puts me a touch over 72 mph - all per the speedo because I don't own a GPS.
Regarding tires - someone at JV had those tires and I wasn't all that impressed with them on those rocks - they seemed to lack lateral traction for such an agressive tire. That said - those rocks seem to like the BFG Crawler Comp and MTR tires best - and those tires aren't always great for everything else.
Do you have to run metric tires? If you can get back to 15" wheels your pocketbook will be much happier.
If you are building for a more streetworthy, towing, camping, fun, expedition TJ you might just find yourself a set of BFG All terrains and call it good. They work damn good in nearly everything, are super quiet and well mannered on the road, and last a long time.
Food for thought.
Jeff
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Now I've always been puzzled by the yin and the yang - It'll come out in the wash, but it always leaves a stain
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