For that kind of $ to put a 4:1 added to the cost of the SYE, you should think of putting that $ into a dana 300 with a flip kit, twin sticks, and a 4:1 gear. Maybe even a Rocktrac case that is used in the Jeep Rubicons. And of course if you have even more $ and less patience a Atlas t-case.
You can get a 4:1 kit from Tera Low and others SYE from many places.
Troy