The permanent keeps all of its abilities. Notably, if Swift Reconfiguration enchants a Vehicle, that Vehicle gains crew 5 in addition to any crew abilities it already had.

If the enchanted permanent was attacking or blocking (or being attacked if it's a planeswalker) when Swift Reconfiguration becomes attached to it, that permanent is removed from combat.

If Swift Reconfiguration becomes attached to a creature that is also a planeswalker, that permanent loses its planeswalker type. Its controller may still activate its loyalty abilities as normal, but it can't be attacked and damage dealt to it doesn't remove loyalty counters.

If Swift Reconfiguration becomes attached to a creature that is also an Equipment, that permanent becomes a Vehicle and loses the Equipment subtype. If it is attached to a creature, it becomes unattached from that creature.