For the MN12 tranny (Z06) 3.90's are best.GR8 WHITE said:What gears would dyno suggest with head/cam package? 3:90s or 4:10s?
Unless you have the right GM tools and have the shims for the proper set backs do not attempt. I have seen shops that have been doing rears for years screw up the C5 differentials.fastz06vette said:Just bought 3.90 gears for my 01' Z06 and was wondering what else is needed in the process of swaping the gears?? Also is it true it will take a full second off your q/m time??