I have just the corvette servo in my truck and it shifts a tad bit harder than stock. I am slo thinking about the Shift kit just to prolong the life of the tranny. Or I will just get a tune done to make the tranny shift harder than it is now. On the 4th billet servo what will you gain by installing it? All I heard so far is it will allowyou to lock the torque converter up at wide open throttle. is this true? And what other advantages can you gain with the 4th billet servo?