The balls would have got hot as a result of the diff slipping. The use of any mod or 19t motor will require the use of a slipper to avoid this issue with any confidence. If using the stock silver can then when you rebuild it do it up until you can feel resistance when turning the wheels, at this point they should not spin freely when you hold the spur. this should be tight enough. another check is to put the rear tyres on the ground and pull the throttle, any slipping noise should come from the slipper (if fitted) not the diff.
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