Blender Problem With Array and Curve Animation! (Tank Track)

Hello! Please help me to solve that problem! I make a tank track in Blender, using array and curve modifier. Also I made an animation by changing x-location of one part of track. I exported that in UE4, but there track moves in X as a whole. Also I cant use armature because when I use it, any bone deformation move track as a whole.
Thank you in advance!