You will be fine. In my opinion 4.56 is a bit over the ideal range for 33's with your transmission but its the best choice because there isn't something between 4.11 and 4.56. Your RPM's might drop 200 or so for the same mph, and I assume right now you run around 2800rpm at 70mph? By going to 35's you will be just at the lower edge of your power band at highway speeds. You could plug your tire size and gearing into the online calculator to get an exact answer, but 4.56 on 35's is not bad. I run 33's on 3.73 and while it isn't ideal and one day I will regear, it is fine for my daily driver and does fine on technical trails as well.