Linked objects not animating correctly in Unity 5

Hi, we have built a model in 3DS Max of a ferris wheel and each carriage is attached to the big wheel as a linked object so that they will follow the big wheel when rotating and also the bottom of the carriage will always point to the ground. We exported the FBX with animations and imported it into Unity setting the animations to Legacy, it was all working fine with Unity 4.x but when we port our app to Unity 5, the carriages no longer have the bottom pointing to the ground and instead it rotates with the big wheel (so the carriages will end up upside down after half of the animation was played). Is there some special settings I have to make in Unity 5 in order to fix that?

Any advice will be greatly appreciated. Thanks!