The ring and pinion is not supported by any bearings, just bushings in the case. Bushings wear out thus wearing the case then the ring and pinion are destroyed. Most of these I have looked at were less then 2 years old. You cannot even find the internal parts, you have to purchase the whole unit which the last I checked were between 300-400.00. The small atv's only cost 500.00. Don't know if all these units are alike, all I can say is I have looked at about a dozen of these with all having the same results.
TOM
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