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I had 3.73's installed in November. The additonal rpm wasn't that bad at all at 75mph on the interstate. I had 3.15 then 3.42 and now 3.73.
I wish I had simply done the 3.73 the first time.
The car is hibernating now. I can't wait to get it back out, finish breaking the gears in and really roll on the gas. If you do go with 3.73's, also plan on ditching the runflat tires. Traction will be an issue.