Transmission Building Services:
6L80/6L90 & 8L90
Here at 4DHPClub, we LOVE to TORTURE OEM parts to find their weak points! We certainly do not stop the torture tests at one of the most critical driveline components. We have put in extensive hours of research and testing to provide the best possible transmission upgrade to our customers.
It’s safe to say these transmissions are stout, as several of our shop cars and hundreds of our customer cars are achieving 1,000-horsepower and more! Our 4DHPClub built Twin Turbo CTS-V is making 1,374 Horsepower to the rear wheels with our 800whp+ spec 6L90E transmission. Although we know our transmission won’t last forever at these types of power levels; we do our best to maintain the transmission and generally pull it apart after a each season of torture for inspection, cleaning, and freshening up.
With that being said, we can honestly say that GM has done a great job with the 6L & 8L series transmissions, but unfortunately, they have been known to fail in stock form as well as high performance applications. The most common reasons for failure are lack of maintenance and improper calibration. In addition, they are known to fail in factory form & calibration as the transmission calibration does not command enough line pressure which allows the clutches to slip just enough that transmission failures do occur, even on vehicles without any modifications.
We are a one stop shop for all your transmission needs. Whether it’s a simple rebuild, a max effort build, or anywhere in-between!
Please contact us for all your 6L80E, 6L90E, or 8L90E transmission service needs.
You may contact us directly for more information at Sales@4dhpclub.com, and one of our professional staff will be glad to assist you!