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Hey guys I want to get everyone's opinion on this one. I have a '69 RR that I am currently restoring and I am trying to decide what gear ratio to use in the rear end (currently a 3.23). I want to be able to use it on the street for cruising, but want to be able to light up the tires when I feel the need. The obvious choices are 3.55, 3.73, or 3.91 for the set up but I have only driven a 3.91 other than my 3.23. I am afraid a 3.91 might be too low and give me too high of rpm's with whining going down the highway. SO I am thinking that narrows it down to 3.55 or 3.73. Any opinions on which is better or is there even a noticeable difference between the two? Thanks for helping out!!

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Before selecting a gear ratio..

I would ask a couple of questions..
1. Type of trans; Stick or Auto
2. If Auto, type of converter & stall speed
3. Engine build like what cam, compression

My experience with the Mopars is that the 3.23 is a great gear, more for cruisin. If the engine is built somewhat like bigger cam (low vacuum) I would step it up to a 3.55. As the engine is built up, typically the HP moves upward while dropping the lower end torque. Also What type of driving also is pertinent here, country road cruisin or stop & go..

Just my ..