2004.5-2005 Duramax DT550 Transmission w/ Torque Converter (dt550-LLY-6speed-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 heavy hauling rig.

Part Number: dt550-LLY-6speed-TQC

• 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? 

• Plan on upgrading your injectors and CP3 down the road
• Might consider an upgraded turbo
• Mainly daily drive your truck or use it for work
• Lug your truck in towing situations often 
• 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 a built transmission that’s made in the USA
• Value a warranty that covers 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
• Upgraded 6 speed valve body
• Brand new solenoids

Upgraded C3/C4 Return Springs

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