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would 3.55's be my best choice for a 5 speed mach with 28" tall tires? I heard that it should be more like a 3.27 gear with the 28"s. is this true?
 

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3.55's will be fine, especially with a mod motor. I think people get a little carried away waving the "3.27 or Die" flag.


My car has 3.27's in it and runs faster on 26" tires and 28" tires.
 

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I'm current running a 3.73 with a 26" tall tire and it rips pretty good. I'd bet a 3.27 or 3.55 would probably be best as I can destroy the 315/30/18 Hoosier drag radials from a 3rd gear roll once boost comes on (haven't tried brake boosting yet). 18 psi from a 7175 precision turbo shoving air into a little 4.6L will do that though. :)
 

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3.55's may be a good choice as long as you can keep your foot planted and the tires hooking. 3.73's would most likely ensure crossing the traps (1/4 mi) closer to my peak HP but, I think 3.27's will be overall better for a mostly street driven turbo car. I'll let you know first hand soon.
 

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I run 3.27 gears.
 

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I have 3.73's and dislike them. I run 4th out to quick and then catch 5th and it's pure dog####. I'm betting if I ditch the 3650 and went t56 the 3.73's would be nicer...
 
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