Cherokee rear axle
Even 2001 Cherokees could have a 8.25". The primary problem with a Liberty axle for Jeep swaps is the width (I think it's two inches wider) and the four-link setup instead of a leaf setup. If you're going to swap an axle into an A-body, bang for the buck would be on a Comanche Dana 44. I'd buy the JKS high-clearance shock mounts so you can inboard them a bit more