I can't explain to you how the gears work, but I will tell you that I was in the same boat as you. And I ordered my 3.90's Monday. I do a good amount of highway driving too, and I think with the 3.90's it is perfect if you do highway driving. It's better than 3.73, but not as tall as 4.10. I posted a link in another thread of a guy that filmed and commentated while driving his stang with 4.10 gears. In 5th gear, he was doing 70mph at about 2,600RPM. And 80mph around 3kRPM. But when do you ever really drive above 80 while cruising, unless you are racing. It also showed him doing 135mph all the way through 5th at about 5kRPM. If anything, it might keep you from speeding, IMO. I had a 5.0 with 3.73's and it makes a huge SOTP difference. I think everyone with gears will say they have no regrets, other than maybe getter too small a gear.
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2000 Mustang GT Cpe: Black on Black, Saleen Rep wheels: 18x9 Frnt, 18X10 Rear (MT), Eibach Prokit springs, Mac Prochamber, Flowmaster, 3.90 Motives (MT), Xcalibrator 2 (custom tuned), C&L Plenum/Mac 75mm TB, Steeda UDP's.
2000 Suzuki GSXR 600:
Jet Kit (Stage 1)
Micron full exhaust
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