You would if you went from the stock 205s that came on the jeep and than jump right to 31s. you are just use to not having any pep, put a set of 205s back on there and it will come back to life.
The biggest problem people have is putting bigger tires on and not regearing, than thinking its great or livable.
Lucky for me I do all my own work so it just cost for the parts so it's not that big of deal.