QUESTION Something strange with normals

[Fedorbikonya]

I was modding this suspension, only the left side. After that I've duplicated them and this happens. Was modelling in Blender

 

[chopsuey]

And it looks like this in blender too?
Is it when you add a normal map that it does that?
If you want, make a zip of your blender or fbx file + textures I'll look at it when I'm home

 

[Ryno917]

It looks like you've got an AO texture on there that doesn't match up to the model as well, so it's a little difficult to tell what's goin on with the lower arm.

I do see some objects with inverted normals, though. In edit mode select those parts and press Shift+N to recalculate normals. It should flip them back to the correct orientation; if it doesn't you may need to check the "inside" (or similar) box in the lower left tool palette that pops up when you press Shift+N