6L90 Level 4 Rebuild: Rated Up To 1100 RWHP 

CDT Level 4 6L90 bench rebuild includes labor and all parts itemized below. You will need to ship your transmission to us for the rebuild. If you’re interested in us supplying a transmission core to rebuild please contact us for availability.

6L90 CDT-BROC (4140 HTSR, BILLET REINFORCED OUTPUT CARRIER) This part is designed for vehicles producing over 750 RWHP, Nitrous or Heavy Vehicles (including trucks, SUV's and CTS-V’s). 4140 billet steel drive plate to strengthen the spline area. The drive plate is milled and contoured to the planetary housing to eliminate any possible separation under a load.

CDT456L3/90 (4-5-6 CLUTCH KIT)
8 G3® Clutches
9 Lindered Steels (varying thicknesses)
1 Stepped Apply Plate
1 Wide Backing Plate
1 Snap Ring
2 Hi-Per Blue® Bonded Pistons

CDT456L3/80 offers 45% more clutch apply area than stock. G3® friction material is formulated to achieve minimal wear and maximize heat resistance. Lindured is a chemical and heat treatment process that hardens the steel, which results in less wear. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance, with better fit and performance.

104690-45 (BILLET INTERMEDIATE SHAFT & 4-5-6 CLUTCH HUB)
One-piece 300M steel forging is heat treated and shot-peened for maximum durability. This shaft doubles oil flow to the clutch pack for improved resistance to heat and longer clutch life. The hub is designed for use with Powerglide-style, 45-tooth frictions. This shaft is designed for use without OE dampner.

CDT35RL3/90 (3-5-R CLUTCH KIT)
7 G3® Keyhole Clutches
7 Kolene® Steels (varying thicknesses)
1 Steel Plate
1 Apply Ring
1 Backing Plate
1 Snap Ring

CDT35RL3/90 offers 40% more clutch apply area than stock. G3® friction material is formulated to achieve minimal wear & maximize heat resistance. Keyhole Clutch design allows a significant amount of ATF to escape out of the O/D and I/D channels to improve clutch engagement. The pooling of ATF in the slot and hole separates the friction and steels when the clutch is disengaged reducing parasitic drag and heat build-up. Kolene® Steels provide a surface treatment the enhances wear & fatigue resistance.

CDT26L2-3/90 (2-6 CLUTCH KIT)

7 Red Eagle® Externally Splined Clutches
6 Red Eagle® Internally Splined Clutches
1 Externally Splined Steel Plate
1 Hi-Per Blue® Bonded Piston

Red Eagle® Clutches are designed to limit the amount of slip providing a shorter apply time, generating less heat. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.

CDT1234L3/90 (1-2-3-4 CLUTCH KIT)
6 Alto High Energy® Clutches
6 Steels
1 Backing Plate
1 Snap Ring
1 Spiral Snap Ring
1 Snap Ring Kit
1 Hi-Per Blue® Bonded Piston

Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.

CDTLRL2-3/90 (LOW-REVERSE CLUTCH KIT)
6 Alto High Energy® Clutches
6 Steels
1 Hi-Per Blue® Apply Piston

Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.

CDTVBPKL3/80-90 (VALVE BODY & PUMP KIT)
2 Boost Valve Springs
2 Clutch Regulator Valve Springs
1 Center Support Seal Kit
1 Pressure Regulator Valve Kit
1 Line Pressure Booster Kit
1 O-Ringed End Plug Kit
1 Pump Slide Spring

CDTMKL2-3/90 (MASTER KIT)
1 High Performance overhaul kit engineered utilizing premium materials for racing.
1 Bonded OE Valve Body Plate
1 Bushing Kit (includes extension housing bushings)
1 Pan Gasket
1 Filter
1 Oversized Pump Washer

*$5,995 does not include any Hard Part damage, Torque Converter or TCM/ECM tuning. After an internal inspection of your transmission we will notify you of any hard part damage that will carry an additional cost. Also, if your vehicle is pre-2010 we may need to install a new upgraded pump stator (cover) and 1-2-3-4/3-5-R drum, which are about $300 each.

Warranty varies according to application. Please refer to Warranty Info page on our website.

Shipping If you need assistance shipping your transmission, we can arrange Domestic Shipping (averages $250 - $500 each way) for your transmission. Please complete the Shipping Questionnaire on our website (listed under the Contact Us tab) if your would like us to arrange shipping.

Transmission Tuning We do not supply a TCM or ECM tune. Please understand that proper tuning of the TCM and ECM are mandatory. All 6L90’s are torque base shifted units. The torque signal is calculated thru the ECM. Therefore, transmission performance & longevity are directly dependent on the delivered torque signal that’s calculated in the ECM. If this is not done properly, you will experience premature transmission failure. We also do not recommend maxing out pressures or deleting torque management completely because it will cause seal failure and/or hard part breakage. Please contact us for tuner recommendations. A review of final tune and final log files is included. Once your final tune and log reviews meet our requirements we will document this in our records for warranty purposes. Please only drive the vehicle for tuning purposes until this process is completed.  

Flushing Cooler & Lines We cannot stress enough the importance of flushing the transmission cooler(s) and lines, even if they are new. We recommend using a Hot Flush Machine or something comparable.

Auxiliary Cooler You need to install a stacked plate auxiliary transmission cooler (not a tube & fin style cooler) rated for 25,000 GVW. The ideal operating temperature for this transmission is 180°or less. These transmissions have a tendency to run very hot – the cooler will lower operating temperature and recovery time which in turn will extend the life of your transmission.

Thank you for the opportunity to assist you.

Stay Safe and Have Fun!

The Crew at CDT