The spare axle shouldn't be too much, just make sure you're staying with your wide track axles, the narrow tracks of the '81 and under era won't fit. Becuase everyone is going to 1 -piece axles, you should be able to find a set for about $50. I spun one of mine (eons ago it seems) and a friend gave me one for free as he had 8 of them laying around. Should be an easy swap on the trail.
JEEPN
'81 CJ-8 Scrambled!
GM151/SM465/NP205/7" Lift/33" Swampers/D44's F&R 4.10's & Lockrights
JEEPN
'81 CJ-8 Scrambled!
GM151/SM465/NP205/7" Lift/33" Swampers/D44's F&R 4.10's & Lockrights