OK, I have been driving manuals for years and like how you can slow down by simply letting off gas, upshifting, because the gears are "locked" there until you tell it what to do. Today I seafoamed my motor and was running around high rpm and noticed with my TH400, first gear does this! It "locks" in and slows the truck down when I let off. I installed headers and they are open for now so I may have noticed this before but now it sounds obvious now. My question, what is this called how first stays engaged and how do I get all gears to do this. I understand down highway it will be like hitting brakes, I will get used to not letting off gas all the way unless I want to. Is this same as convert my th400 to a race trans with a shift kit?