I just installed a transgo shift kit in a 1987 corvette. The trans shifts very good. But now twice while driving on the highway, fluid started poring out from somewhere. It doesn't seem to leak at all when I drive around town or the trans is cold. I checked the fluid level and all is good.
I suspect the front pump seal is leaking, but why would it leak now? Can the increased pressure be causing this?

 

Check the T.V. cable and see if it is seated properly that same thing happened to me turned out to be the T.V. Cable seal.

 

My 700r4 that just blew was leaking. It was my TV cable. The bushing/gasket broke. Might want to check that.

 

I removed the converter inspection cover, definitely coming from the front pump seal and definitely started leaking after installing transgo kit, not sure why.

 

could be you had a small leak and didnt notice it but since the shiftkit raises line pressure it may have made the leak bad enough to notice now.