When you look at your slipper plates they should look clean right across their entire face but often, you can see evidence of where the slipper pad has been slipping.
The glazing is like a polishing effect that you'll see because the part of the plate that is touched by the slipper pad will have a different surface finish than the innermost area of the plate.
It's like the pad residue has polished the plate surface and where it has become hot, the residue has coated the plate which now means it can't slip and act as freely as before.
I'm not sure about bulletproof diffs - LOL. Last year I couldn't get one meeting out of a rear diff in my old CR2 but I do know what you mean - I've had 4WD rear diffs last ages but a 2WD one seems to go real quick. But I also know of other non-losi diff owners who struggle in high bite conditions to complete a single race meeting on one diff. Personally, I think it's a combination of the amount of grip we experience in the summer months and the aggrssive motors we like to use. When the grip is not there (like in the winter), diffs seem to last much longer.
I also find I blow diffs in finals or when I'm racing and on it. When I drive like a girl in qualifying, my diffs last much longer :-)
One other thing I'm also finding is that if I go 3 meetings without a rebuild then I've already damaged my diff balls - and the new rebuild doesn't last as long. Thrust race balls are vital as well. They may feel smooth but often, they really affect the performance feel of the diff and they're often overlooked during a 'quick' rebuild.
HTH
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