Thread: 69 GTO
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  #35  
Old 05-28-2018, 04:33 PM
Bigd400 Bigd400 is offline
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Quote:
Originally Posted by north View Post
Depends on your goals, no question that 3.90's will buzz on the highway but bear in mind that a RAIV engine seems less annoying because of its free breathing characteristics but also NEEDS steep gears due to the high valve overlap-duration (no bottom end grunt), remember that the 3.90's were a compromise to begin with in 69, all previous Ram Air and Ram Air 2 cars came with 4.33's only. I think 3.23's would be a mistake for a RA IV car and 3.55's would be close enough that you might as well have the 3.90's. My opinions though are based on the typical collector car lifestyle of mostly sitting in a garage with limited cruising. If you wanted to use the car for long drives and trips maybe a overdrive automatic (TH700 etc) is an option.
Hmm I thought it still went pretty good with the 3.23’s! Always appreciate your feed back.