Go with the 3:73's, the highway rpm is just a little higher than 3:55's, not much at all though. I went with 3:55's on my 89 GT when I had a few mod's, and if I would've went with 3:73's I would have been running high 13's, instead of low 14's. With the 3:55's, I had to shift into 4th right before the traps....3:73's get my vote.
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