What's the best rear gear ratio for obtaining the Viper's top speed?
For a stock Viper, stay with the stock 3.07:1 rear gear. If you put a 3.54 gear in a GTS the top speed will be about 177 mph, which is 6100 rpm in 5th vs. 190 or so at 5700 rpm with a 3.07. Many combinations have been tested, and the 3.07 is the best gear for all-out top speed.