c4hybrid2007

Well everybody seems to be on back order for the Strange 3.42 thick gear set so i ended up getting the 3.73 gear set. They will be installed next thursday at Outlaw Motorsports in Joliet,IL. Was wondering if I will for sure need a tune when i get these. I dont want there to be dead spots and/or shifting problems along with my speedometer being messed up. Im pretty sure Outlaw is going to take care of me but incase they dont have there tuning software will i need this done asap? Will the car shift like crap without it? If anyone from Outlaw reads this let me know as well what u think. Thanks John