What does a trans lockup switch do, and will it benefit me?
 

Simple question, I figure? I know it creates a direct-drive or something or other... its supposed to help with economy and power... but thats about all I know about that.

It locks up the Torque Converter...

I hope this page helps shed some light for you... It is for a 4r100 but I think it will give you the idea...Welcome to guzzle's TC Lockup Mod Web Page

So basically it does exactly what tony wildman is gonna do for me in my custom tuning; take better control of the clutches and torque convertor...

Yes sir... You will feel 4 shifts with Tony's tunes... 1-2, 2-3, lockup and then into OD.

Saweet! Thank ya, Sir!