regearing to 4.56 would cost about the same as 4.10. you have to buy two sets of ring and pinions, install kits and pay for install. it wont be cheap but in the long run it'll be worth it
I told you to get them! About $1600 depending on what shop you get to do it. Don't regear to 4.10's. It won't be worth it. get 4.56 unless you plan to run 37's, then get 4.88's. They would cost the exact same.