Hi, I have a 92 with the 4.0L and 5 speed. I am running 35's with 4.10 gears. I would not want to go lower (4.56) unless I spent most of my time offroad-my jeep is my daily driver. On the interstate, I hit 70 mph at about 2300 rpms in 5th gear. I dont like going that fast, so typically I go 65 mph in 5th at about 2100 rpms. I also have a nice smooth take off and good acceleration. So basically, if this is your daily driver which sees the interstate some, Id definitely go with the 4.10's. If you are only going to be off-road or never above 50 mph, go 4.56 or 4.88.
92 YJ 4.0L, 35" Goodyear MTR's, Rough Country Suspension