Lets see.
1. 4-5 inches is enough to clear 35's. You could prolly even go lower with moderate fender trimming.
2. I don't know anything about bilstein shocks.
3. I think the 4.88's and 35 are good for the road, but other poeple prefer 5.29's.
4. Thirds are interchangable, but not the front of the the 86-present.
5. Can't go hi pinion in the rear. High pinion in the front is great for more clearance.
