Services: 6L80E/6L90E Modifications

• Circle D 6L80E Transmission Upgrades - As reported in the March 2011 issue of Gm High-Tech Performance
• "Circle D Makes GM's Best-Ever Transmission Even Better With its Bulletproof 6L80E Six-Speed Upgrades"
• 6L80E Transmission Modifications

Circle D Transmission can rebuild and upgrade your 6L80E/90E into a performance beast! Our custom mofidications set us apart from the competition and have paved the way for us as the industry leader in the 6L80E/90E. Our modifications include things such as our 6L80E custom billet 4-5-6 hub shaft assembly and pack (see below), upgraded 3-5-R and 2-6 clutch paks with nitrided steels and added clutch capacity. The pump and valve body are also upgraded to CDT specs. Our shop owned 2010 Camaro is steadily used for R&D with regards to parts development and tunes so that we can help you push your vehicle to its peak performance. Worlwide shipping is available and our special boxes help eliminate any potential shipping hazards.

***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 11 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 an 80% clutch apply surface area improvement over stock, huge improvement.

This is currently available in our CDT rebuild and they are available for sale individually. Please email us for pricing information.

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 RED LINED 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 SIX (6) MONTH WARRANTY...

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