now if you have a 4x4 with steel driveshafts and you want aluminium do you have to change them both at the same time? or can you wait to change the front or do you even have to change the front?

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1999 ranger 4x4 supercab, 4.0L
-3 inch PA body lift
-16 inch pro comp alloys
-33x11.50 BFG all terrain
-Go Rihno roll bar with 4 KC Daylighter lights
-weston bull bar
-dual exhaust,
-air box mod, tightend throttle cable.