Without putting in a manual valve body, the trans will shift when it feels like it. What you really need to do is think about using a different rear end with lower gears. The idea is to choose a ratio (and tire diameter combination) that will allow your engine to be close to redline in 3rd gear when you cross the finish line.
I know that's an expensive proposition, but that's drag racing. But then again, if you're bracket racing, then consistency is what brings home the trophys. You can use whatever you've got as long as you know how long it takes and what the dial is.
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David
newbie #4153
