Originally Posted by parawxman
Not sure if the math all added up with your hypothetical, as it would require a 4.30 gear in order to top out at 108mph in 4th gear. Using this 4.30 gear, 5th gear would actually begin at 4900 for 108mph, which is similar to what we have already at the top end of the track and would allow us to continue to accelerate until 6K rpm and over 125mph, (HP permitting), or in other terms a 4.30 gear would give us an overall gear of 3.56 in 5th. Actually might not be a bad gear except for significant handicap of 1st gear. Gears like this would be better suited for an engine that runs up over 7K rpm. And better not to use the OD 5th gear as part of the ¼ mile equation
That's why I said hypothetical. 
The actual 3rd gear for SRTs ends at ~108mph and 4th goes all the way to ~150+mph. But it doesn't change the fact that you may have to re-gear once you add more power, or else you'll be upshifting for no reason. Which was what you asked about originally. And like Montana Crossfire said, the gear spacing is more of an issue than the axle ratio. No matter what gear you throw in the rear, you either compromise acceleration at higher speeds or have too much gear in 1st. Maybe if you want to launch in 2nd and run it to 4th, you may be on to something, but that seems a little crazy to me. 
And I agree that you want to end in 4th gear.
Originally Posted by parawxman
Regarding traction, I’ve found this car to be fairly decent for a non posi/lsd and small street tires. The high tech approach to controlling wheel spin without the above has netted me 1.9 short times with the 255’s and with minimal wheel spin, other SRT6’s are even faster. On the street not going to WOT until it is rolling has proven to be an effective launch. Moving to a larger (285), high traction radial or slick would make a huge difference in my car. Once you are too the point of changing to a 3.55, high traction tires would be a requirement for best times, but all of this is a mute point, as recently discovered we currently can’t get gears beyond the NA’s 3.27 due to computer incompatibility issues. But we can always hope.
Just curious, what exactly is this computer incompatibility issue? i.e., does it go into limp mode, or what?