You'll have to wait a while before you start smiling. You have to break them in first. You have to drive for about 10 miles and then let them cool for 30 minutes. Do this about 3 times. Then go for some long highway cruising.
After that, you can probably start getting on it a little. That's when the happiness will settle in. Getting used to the way you shift will take a while, though. It's been a week for me and I'm still trying to get used to them. I went with 3.55s.
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351W 89 Mustang GT Convertible