It's for the front. The WCE slipper is longer towards the front compared to the original D4 slipper. The included shaft makes up for this difference.
On a different note, installing the rear D4 shaft will cause it to interfere with my battery. A mixture of it being thicker and connecting to the gearbox at an angle.
My lipos have little feet designed to mimic a NIMH cell which I think makes it taller. I had to push the battery forward too to stop it from rubbing against the rear coupling.
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