A few questions
 

1) Are dealerships open tomorrow? (MLK)
i want to get my oem replacement radio installed and a new backlight for the lock button installed.

2) How much do dealerships charge to install gears? If my cars warranty runs out will they still cover any problems i have with the gears if i pay them to install them?

3) 4.10s will mean i need a higher rpm to drive 70 on the highway, but if i get bigger rims and tires the rpm needed will lower correct? assuming they dont way alot more then stock.

4) Also, ive noticed alot of lag when i floor it in first gear, but once it gets going its good, CAI will help this a good bit correct?

the stealership will not cover any fault that comes up with the gears. not even if you drive it off and discover they whine a little. they will charge you to fix it.
they probably will be open tomorrow. they need all the money they can get right.
a CAI and tuner with a nice custom tune will resolve your issue. a lot more throttle response.