I bought a 96 x cab with the 2.7 5 speed. With the 225's . I want to step up to 31" or 32" ATs when the current tires are shot and possibly a lift (will need for 32"). So the truck has the 3.58 ratio now, for 31" or 32" would it be better to switch to 4.10s or 4.30 gearing. After searching it seems that would be the time to install a locker also. What is the usual total cost to change out the gearing?