Ok since you list an AX15 tranny I am going to ASSUME you have a 4.0 and not a 2.5.
For the 4.0 as has been stated you want 4.56 or 4.88. And my choice would depend on the amount of on-road and off-road time. For best wheeling results I'd go for the 4.88 but if it is a DD then I'd go for the 4.56 and then look at getting a 4:1 for the t-case. Also how long before you go to 35" tires?
And what axles? D30 front but which rear axle? D35 or D44? If it is a D35 then replace it before you regear. Get a D44 or a Ford 8.8 then regear.