Quote:
Originally Posted by Chris49066SS
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
|
This is part true and part not true. It is more common to use a transbrake in the more common 2, 3 and 4 speed automatics. This is largely due to marketing and overall awareness and parts availability and cost.
The good news is that there is a transbrake for the 6L and the 8L GM transmissions...........
https://getawaycarz.com/
There is not much information on the dependability or the needed part upgrades. I have talked to a popular local Houston based performance oriented transmission shop and the information from customers is mixed. Information about the customers actual experience and expectations compared to or with other transbrakes was stated as unknown. Any Transmission Control Module tune calibrations compared to stock are also unknown.
It still seems to still be a closely guarded secret for the 6L and 8Ls by the majority of users and the set up has some real genuine stealth. If going this route definitely recommend ALL of the transmission upgrades and a transmission cooler if not already equipped. The upgrades will allow for the greater than stock internal torque loads while the cooler will deal with the heat build up. Typical failure has been often due to RPM launch settings, temporary loss of oil/fluid intake due to launch, standing on the transbrake button too long known as burning down the transmission due to the massive heat that build up quickly with a transbrake.
Also suggested would be a 1 piece aluminum or chrome moly driveshaft and an upgrade in the half shafts if still equipped. The shock of the transbrake hit to everything else depending on power will be brutal to the rest of the drivetrain and rear suspension. This is where the preloading of torque to the drivetrain has an advantage.