You say that you have independent suspension with belt drive yet you circle information for a driveshaft differential??? I'm cornfussed.
Sorry fro the confusion but that is way i received the manual the trike is a belt drive
I have never had an occasion to have a Champion belt drive differential apart. I have never heard of one failing and I am sorry to say I don't know what the service policy interval is on it. But I will check right now.
Spoke to Kenny at Lehman/Champion just now. Unless you see a leak in the assembly, there is no need for service. It uses a very heavy grease that is high-temp resistant. He also said there have been no recorded failures.
I hope this helps.