37's rock. You "will" be going slower than most heading up the passes on I15 though with stock gearing. If you run cheap brakes you may feel the difference stopping.
On the positive side, you can now park on the higher planters in various malls.
Do it. The worst that can happen is you sell the tires and put on smaller. If you had to ask and you don't do it, you will always wish you did. I went back to 33's due to worn engine, towing and the distance I drive. I now have a completely rebuilt driveline. Once I regear, you bet I'm going back.