Originally Posted by
InspGadgt
That should work fine. HPI used to include an adapter with their spur gears...not sure if they still do. Dan's also made an adapter. And Kimbro makes some of their spur gears reamed out to take the metric bearing Tamiya uses in their diff. The Kimbro will make the smoothest diff as it uses the bearing...but they are sometimes out of round.
Thanks for the answer guys!
Found the kimbro spur for tamiya f1 cars and it does work smooth