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2004.5-2005 Duramax LLY DT550 Transmission - 6 Speed Allison (DT550-LLY-6)

Calibrated Power
Regular price $9,360.00 CAD

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Purchase to earn 9360  Dirty Dollars Learn More

Description

Fits

Year Make Model
2004.5-2005 GMC/ Chevrolet HD 6.6L Duramax 

Superseded Part Number: dt550-LLY-6speed-TQC

Now includes the LML style dual disc torque converter as standard equipment. Contact us to quote C3 oiler or deep pan options.


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.

DuramaxTuner TCM tuning included.

Part Number: dt550-LLY-6speed-TQC

Features

  • 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
  • DuramaxTuner TCM tuning included.

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

Additional Info

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

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