As long as the diff is still functional then you will not have melted the gear. They do not tend to wear out so you should not need a new one.
If slipping becomes excessive, 1 or 2 seconds of slip per thumb action not a chirp, then it will lead to heat and melted gear.
The stock diff is a little bit of a problem because the balls and diff plates are thermally insulated from everything else, leading to easy build up of heat.
i think it could make sense using the front metal diff outdrives in the back, this will draw heat away from the inside of the diff if there is a little slippage.
The use of ceramic balls will also help as the material will not get as hot as metal balls. Cheapish on ebay.
The 3 racing outdrives i purchased seemed to have missed out on any hardening process, severe wear occured relatively quickly.
Cheers
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