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Honestly Mark, I would recommend you not change the rear. Not really necessary. Car probably runs good enough for what you are doing. To go from a 3.07 non posi to a 3.55 non posi is not really worth the trouble or money. I bet you can spend that money in a better place on your car. Just my opinion.
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Mark, Sammy is right...probably not a good idea to work the motor any harder than needed. I initially thought the gears might be a good idea...but, some simpler bolt-ons like exhaust or intake would be better choices. Get it tuned up and running good...maybe add a little "sound" to your exhaust and just enjoy it. Listen to Sammy...he is older and wiser
