An SYE only affects the rear ds and the output shaft of the t-case. Since you are in the planning mode, weigh the options you have available with the 1" BL. Do note, that the belly pan is also a crossmember at the same time on the TJs.
For bolt-on functions, with the 1" BL, I'd suggest a motor mount lift, the SYE, and a shifter bracket swap. To explain, the shifter is a pivot design. The pivot is placed between a trans mount and the body of the TJ. Lifting the body affects this alignment. Skyjacker sells a bracket you swap in place of the stock configuration. Pretty simple. The motor mount lift will consist of only a high location to mount the engine. Swapping these is quite easy. To add, with maintaining the stock trans mount location, you basically tilt the driveline centerline with an upward swing. This tilts the back of the t-case down. This supports the SYE. You won't be able to use your stock rear ds without some mods to it. Before your buddy removes his, take a look at his setup on the rear ds. If you can use his rear ds, ask for it also. Basically, to find out, measure a point on the back if his t-case to the pinion yoke on the rear diff. Do the same for yours. If they are within an inch, I would say, you are good to go. Do note, that if you can't because of a lift or something else, then with the SYE installed, you can still actually drive on the street with only the front ds moving you in 4hi. You can get your rear ds custom lengthened for your SYE install and measurements. If you plan to do all this with a stock suspension, take one step farther. I suggest you get adjustable upper rear control arms. This will help in rotating the pinion to point to the back of the t-case for better operating angle on the joints.
Take pics, and let us know how it works out. Good luck.
