Was thinking about switching my 3.73 gears to 3.89 or maybe even 4.10. Just wanted to see who is running either of these, and if they like them. What kinda rpms are you running at 70mph, the car is not a daily driver but i still want to run on the freeway once and awhile. The car is a manual 1998 gt w/pi parts and all the bolt ons,and 125 shot of nitrous. Thanks in advance!