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Discussion Starter #1
Is there much of a difference between 327 355 or should I go one step above 355 and does it require a tune
 

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There is a difference. But not like going to 3.73's or 4.10's. And you don't need a tune just plug in your tuner and recalibrate for whichever gear you go with.
 

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Discussion Starter #3
I don't know which one to pick my only concern is I don't want to sound like I'm. Going 90 when I'm going 60 .i just don't want my rpm Togo to high when I driving on the highway
 

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3:55 will put you right around 2k at 70 mph and 3:73 is a few hundred more I think... I've only had 3:55 or 4:10 ... I like the idea of 3:90 myself
 

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With 3.55's the rpms won't be too high on the freeway. I have 4.10's and at around 70 mph I'm pulling about 2400-2500 rpms. At 80 about 2600 rpms. So even if you one step above 3.55's which would be 3.73's, the rpms shouldn't be bad. Probably 2300 rpms at 70. There's a calculator online that can help with this.
 

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Discussion Starter #6
That's great you just helped me decide 373 it is I can deal with 2300 rpm mine is stock with 327 at 70 it's at 1800 or so thank you so much for your help
 

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No problem.. You'll enjoy the 3.73's
 

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That's just on idle
 
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