[cbale2000]

As I mentioned in the first thread on this topic: This is the best demonstration of why to traction-limit drive gearboxes.

In over 3 years and over 100 VP gears and 9 VP gearboxes, we have lost teeth on exactly one gear: the small gear on our 2014 choo-choo mechanism. It was totally our fault, we had way too much tension on the system (at least 500lbs), but it made it all the way through the season before it failed in an off-season event.

Obviously I can't speak for every VP gear that's made, but it might be worth at least considering that you may have a problem with your specific implementations, and not with the gears themselves.