I changed out to the Pennzoil syncromesh before my last race at Mid O. Shifts did not feel much different aside from it seemed to help the slightly sticky reverse. When I drained my fluid I didn't see any contaminants from the Redline but that is not to say it would damage the plastic in a way that would cause contaminants.
The biggest thing I am noticing with my trans now is a bad or failing motor mount. As I load the engine on elevation changes it becomes difficult sometimes to find fourth gear especially; occasionally third. I will be replacing the motor mounts this winter with a higher durometer mount per the motor mount rules added to IT this past year.
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