You can do what is call the "Brown Wire Mod" to keep it in 2wd. If you do a search on this site you will find it. I did it and have a switch to diable and enable the AWD. The 4LO and 4HI still works when selected.
I replaced my cats(four) for two Magnaflow High flow Cats. Oxygen sensor were retained fore and aft of the cats so it still passes emmissions and does not give a check engine light/code.
You can use the keys you have now. The bars are the same lenght, the only difference is the stiffness of the bars. I replaced mine when I did my lift and remove my air supension.
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