Thanks for the feed back. The diff assembly is shimmed in the housing and, at least when it was built, had very little slop. With that said it may have "loosened" up a bit from usage.
I will run her tonight and see how it sounds with the cleaned and lubed spur/pinion. If the clicking persists I will open up the rear and dig a bit deeper.
Thanks all.
Cheers,
Jim
Check the gear lash between your pinion and spur. The Tamiya pinions are fairly soft and will start to wear quickly. They won't feel too bad when spinning by hand, but get loud when you speed them up.
Another thing to check is to pull the motor out completely the next time you hear a click and spin the spur by hand. Do you still hear the click? Do you feel a click? If not, then you probably have a spur/pinion issue. If you do still hear it, pull the center shaft and spin front and rear independently. Which one clicks? Etc... Work you way out until you find your issue.
Or, just wait! Eventually, whatever is clicking will fail.
