The only way you'll find a rear axle that fits directly, without at least moving the spring perches, is from another Comanche. And the only reason to swap one MJ axle to another (other than to change ratio) is if the replacement is a Dana 44. Good luck finding an MJ Dana 44.
I found an MJ specific Dana 44 on craigslist....for $400.... :eek: :eek: