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The transbrake with a 2 step lets you build boost at the line before the hit with turbo cars since you are putting the motor under load. The transmission is literally pulling itself apart in 2 different directions, forward and reverse. Leaving off idle you aren't building any boost, and with footbraking you are limited to whatever your converter will allow for raising the rpms and there is always that chance you will accidentally push through the brakes and possibly red light. The 2 step gives you the really consistent launches. No one ever seems to run a transbrake with the 6L80 though, I haven't heard of one being made for it. You usually see 4L80s and TH400s with the transbrake. Its just me, but I wouldn't trust the 6L80 with a transbrake past 700rwhp. Sounds like 3..2..1.. BOOM to me, IMO
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