I think your honestly best bet would be to borrow/use a GPS and find out your real speed.
When messing with regears, you don't know for sure how fast/slow you're going.
If they simply regeared but didn't regear the tranny, you'll be reading 55 while really driving at 45.
Or the other way around.
Lastly, draw a line on your tire, and count how many times your driveshaft turns for one 360* rotation of the wheel.
My Jeep is a chick magnet with reverse polarity.
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2000 WJ, 4.5l, AX15, 242 D60/14b, 5.5" lift front, 7.5" rear. Ford Expedition rear coils, Ram 350 shocks, JKS, IRO Long Arms, cool Badlands flag thingy.
1987 XJ - Gone but not forgotten