2001-2004 Duramax DT550 Transmission w/ Billet Torque Converter (dt550-LB7-5-TQC)

Fits

Tired of harsh shifting or banging gears (no pun intended)? These DT550 fully built transmissions from Calibrated Power give you smooth, positive shifts & easy torque converter lock-up; perfect if you are building a reliable daily, or do a lot of frequent towing.

Part Number: dt550-LB7-5-TQC

• 5-Speed
• C1 - C4 Raybestos GPZ Clutches 
• C5 Raybestos Clutches 
• Improved clutch torque capacity 
• High heat resistance
• Smooth engagements
• Maximized reliability
• Better durability than stock
• Made in the USA

Is this Transmission right for you? 

• Aren’t looking to upgrade your injectors and CP3 down the road
• Might consider an upgraded turbo
• Mainly daily drive your truck or use it for work
• Tow light to medium loads frequently 
• Have a high mileage or worn-out transmission
• Are experiencing limp mode
• Currently have P0700 codes
• Experiencing other mechanical issues with your stock trans
• Quality and Reliability are your top priority
• Want something made in the USA
• Value a warranty with unlimited miles in the 1st year

Extra Clutches

• DT550 has added clutches for stronger clutch holding capacity
• The factory Allison has 12 C1 clutches. The DT550 has 16
• The factory Allison has 6 C2 clutches. The DT550 has 7
• The factory Allison has 4 C3 clutches. The DT550 has 6
• The factory Allison has 5 C4 clutches. The DT550 has 6

All New Electronics

• New Neutral Safety Switch
• New Speed Sensors
• All OEM Electronics and Sensors
• No risk of corrosion, shorts, and bad connectors.
• Trouble free operation
• Provides long-term reliable performance we can stand behind

Upgraded Valve Body

• TransGo shift kit with Mike L. upgraded shift springs 
• Provides quicker, crisper shifts 
• Brand new valve body and solenoids

Upgraded C3/C4 Return Springs

• Stronger and more durable design 
• More dependable clutch pack release 
• Improves shift quality  

Upgraded Billet Torque Converter

• Totally Custom for the DT550
• Goerend Billet Triple Disc (Stock has one disk)
• Designed to rotate smoother when coupled 
• Forged front cover and clutch pistons
• Insures torque converter clutch lock up 
• Superior strength to stock
• Smooth consistent lock-up
• 1800 - 1900 RPM Stall Speed
• Perfect stall speed for towing and daily driving
• Provides reliability for increased power levels

Upgraded Transmission Case

• Pre-drilled to accept C3 Oiler upgrade (Even if not selected)
• Easily upgradable in the future
• Upgraded Line Pressure Spring 
• Upgraded TransGo lock-up valve 
• Increases line pressure for stronger clutch holding force