Looking for a complete solution for your 6L90 Transmission? Have you reached the power level to start thinking about your transmission or is your transmission already flaring into gears? A lot of guys talk a good game, but Circle D backs it up with solid performance and the best materials along with custom building and tuning to come up with the perfect solution for your performance needs.
Our Level 1 Performance Package starts at only $4,999! I ran this transmission in our 700hp and we made over 20 passes in an afternoon on it without skipping a beat for a best of 10.5 at 135MPH!
A Custom Tune package is a must for this trans and makes a huge difference in the performance. This takes a few hours to "Dial in" . We will do this for you using your HP Tuners.
Depending on heavier abuse and power levels, the stock rear planetary has been known to break. We have several different other options available including upgraded Planetary assembly, billet shafts, and Billet High Stall Converters to customize a solution for you.
Our Performance Torque Converter includes Furnace brazed Turbines and HD bearings throughout. Fully upgraded Kevlar Clutch material and increased surface area for extra holding capacity. Custom Tune package is a must for this trans and makes a huge difference in the performance.
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