I just bought me gears about a month ago and I, like you, had some concern about the 3.73's reving too high.
I went with the 3.73's and all I can say is that I love them. They are perfect, even for my car with the stock heads and intake (which restricts me from pushing much past 5,000 RPM).
In the city they are great, I even noticed and INCREASE in gas milage over my stock 2.73's! On the highway they are fine, I don't do alot of driving over say 65 mph, but I do go 60mph a fair bit and I have no complaints.
There is not going to be a big difference in RPM from 3.55's to 3.73's at highway speed, I bet only a couple hundred RPM.
Even with the 3.73's I can see why people install 4.10's.
Just my take on it.
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