Recently I purchased and read a book titled "How To Restore & Modify Your Corvette 1968 - 82" by Richard Newton. In it he says an effective way to increase the snap in the shifts is to to drain all of the Dexron from you automatic transmission (including the torque converter) and refill it with Type F . He opposes shift kits as he says they may increase transmission pressures too much for an older transmission. Has anyone tried this? I would like to hear fron anyone with experiences like this or opinions on the subject.