you can drive around with 4.10's without problems for the most part. but i wouldn't advise it.
the car will drive fine because the shift points and torque convertor functions are programmed by MPH and throttle position for normal driving. so if the car normally shifts from 1st to 2nd at 20mph with 3.27's, it will shift at what it thinks is 20mph (actually 16mph) with the 4.10's. WOT shifts are programmed by RPM. this is a little more of a concern than normal driving shifts. with the 4R70W, there are Commanded shifts and Actual shifts. what that means is that the computer "commands" the shift at say 5000rpm but it takes the transmission about 1.5 seconds to fill up the clutches needed to make the shift. in that 1.5 seconds of time, the RPM rise another 1000rpm to 6000rpm. so even tho it's commanded at 5000rpm, the actual shift is at 6000rpm. now when you add alot of power OR change the gears, it increases how fast the RPM climb. just for reference, let's say that instead of climbing 1000RPM in that 1.5 seconds it takes to fill the clutches, it now climbs 1500rpm. your new actual shift point will be 6500rpm. you'll start banging against the rev-limiter. a new tune can lower your commanded shift from 5000rpm to 4500rpm to compensate for this. so between that and the 20% or so extra odometer mileage you'd be putting on the car, i highly recommend you get it tuned. and don't forget a tranny cooler.