Quantity (2) "T-Lock" Differentials/Gearboxes for the 1/10 Scale Traxxas Summit.  

They appear to be in good condition, but they have not been tested in a Traxxas Summit.  The gears do turn on both, but unsure how to test the locking diff function.  One of the diffs has a small leak by the bearing.  Thus, they are sold "as-is".