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You're right about the RPM's, Rukee. But a 421 rev's lower than a 389, and makes more power at lower RPM's. While a 3.55 is the standard gear for a 389 equipped stickshift 3400 pound GTO, the usual gearset for a big Pontiac with a 421 and stickshift seems to be 3.42 or 3.36. 3.55 was considered the best "all-around gear" in the GTO back then....... Like you, I had 3.90's out back until I went as long legged as I could: 3.36's. I have no regrets!!!!!!
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