Hi, guys, wonder if you face the same problem here with regards to TC6 rear ball differential.

As far as I know, ball differential (bd) works correctly if you turn a wheel in one direction, the other wheel would turn in opposite direction.

I have tried to rebuild it about 5 times including using different brand of bd grease (3racing, xray & Schumacher), changed new 3/32 balls, changed new steel plate), but it would not work (both wheel turned in the same direction)

When I turned the bd only using my hand, the other side turned in opposite direction, but I could feel the friction.
When the bd was installed in the car with wheel, using hand, both wheels went the same direction.

What went wrong??

Sigh...