AX15 will cost you about $200-$300 on CL. About $75 for the bellhouse to adapt it, and then about $120 for the clutch kit. You will need your front and rear drive shaft lengths changed, but you need that anyway with 6" of lift if you want it to flex without any problems.
The thing is that the tires arent what kill the AX5 exactly.... The harder you make it to move the Jeep is what makes a difference. 6" of extra height at 65mph makes a big difference. Add big tires and small trans and the trans will give out since nothing else is going to. When you put an AX5 next to an AX15 you will see what I mean. It is like Hercules VS PeeWee Herman.
Take care of your trans and Suspension, then get tires when you have the cash.
I'M FLEXY AND I KNOW IT
95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, Safari Snorkel, Warn VR8000 Winch, Smittybuilt front Bumper, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo