Services: 6L80E/6L90E Modifications

• Circle D 6L80E Transmission Upgrades - As reported in the March 2011 issue of Gm High-Tech Performance
• 6L80E Transmission Modifications

Circle D Transmission, still advancing with 36 years of experience in the transmission industry, is ready to turn your 6L80/90 into a performance beast. Our continued development in custom modifications and billet upgrades makes your choice an easy one. Coming soon, a CDT custom output carrier with billet spline upgrade to eliminate the OE spline failure in high HP vehicles. Other CDT modifications include our custom billet 4-5-6 hub shaft assembly & HD clutch pack (see image), upgraded 3-5-R and 2-6 clutch packs with nitride treated steels and added clutch capacity. The pump and valve body are also upgraded to exclusive CDT specs. Our 5th generation shop Camaro is steadily used for R&D of upgraded components and tune modifications so that we can help push your vehicle to its peak performance. With our custom packaging, we can ship worldwide with confidence. Give us a call today to discuss your build.

***Circle D Custom 300M Billet Shaft***

It’s finally here...after a solid year of R&D Circle D's Custom Billet 4-5-6 hub & shaft assembly is ready for you. The shaft is CNC machined from 300M material and the clutch hub is 4140 material, then heat treated and stress relieved for maximum durability. This is not just an OEM replacement, it uses our "Super Drum" clutch pack, which is equivalent to 10 OE clutches, OE is just 6. They are Carbon based friction plates and Nitrided Steels and we still use an extra thick Apply Plate and End Plate so no compromises on coning. This is a 70% clutch apply surface area improvement over stock, huge improvement.

Below is information about our upgraded 6L80E transmission. This is a procedure that we can do on a low mileage vehicle (normally 25,000 miles or less) that has not had a major failure that would require a rebuild. We disassemble the transmission, perform an inspection, clean and make our custom modifications.

1. INSTALL HIGH ENERGY CLUTCHES & CUSTOM NITRIDED STEELS

Mathematically, these upgraded clutch packs average about 600 HP. We have been successful with 600 HP vehicles that install our upgrades and have proper transmission tuning.

2. PUMP AND VALVE BODY MODIFICATIONS

We modify pump and calibrate valve body to Circle D specifications. If the transmission does not have the latest valve body & pump they will need to be replaced; normally pre 2009.

3. HELIARC WELD 2-6, 3-5-R & 1-2-3-4 SHELLS

These shells come spun welded from the factory. We do additional welding on these components to strengthen them.

4. TUNING

Proper tuning of the transmission pressures, shift points and lock-up apply are all major components to ensure that the vehicle can handle additional HP. There is not one tune that meets every vehicle’s needs. We can review your vehicle’s tune and make suggestions or changes. Charges for this service vary upon application and prices range from $200-$500.

CALL FOR PRICING!!!
LIMITED 1 YEAR or 12,000 MILE WARRANTY...

PLEASE CALL OR EMAIL WITH ANY QUESTIONS...713.895.7019
info@circleDtrans.com