Not Ranked
I'm by no means a expert on these matters, but I have a Toploader on my Kirkham and after a hard day at the track, I had no such problems with mine and I don't ever recall hearing about gearbox cooling problems on original race cars.
Could it be that the shifter linkages aren't correctly adjusted and the extra heat is exacerbating the problem? I think it would be worth checking the linkages first to make sure they are spot on.
Paul
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