I tried to put Xray's multi diff into the TCX front, and Xray's ball diff into TCX rear with Xray 50mm bones. Perfect fit!!!! Now the car looks solid!! Front belt tension is ok. Rear belt little loose. Tried Xray T3 belt, but toooo tight. I will race with this until the TCX spoon and gear diff arrived.
Yes, the spool cups are fit for Yokomo & TOP dogbone also. If you want to use 44mm dogbone, you can order new spool cups TRF-02. This is longer. Thanks