My Tremec fried soon after I installed my B&M sport shifter. Of course, the service department immediately zeroed in on this-- I must admit to being a bit freaked out about the possibility myself.
But, I did my research, held my ground, called bullsh1t whenever necessary, and eventually got my tranny replaced under warranty. In the end it turned out the failure mode was the tail bearing frying out...completely unrelated with the shifter bolted on the top of the housing.
So...don't worry about it.