2004.5-2005 Duramax LLY DT750 Transmission - 6 Speed Allison (DT750-LLY-6)

Fits

Superseded Part Number: dt750-LLY-6speed-TQC

Now includes the Goerend billet PTO cover C3 oiler plates and steel Allison deep pan as standard equipment.

Tired of harsh shifting or banging gears (no pun intended)? These DT750 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: dt750-LLY-6speed-TQC

• Alto G3 C1 - C4 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

Extra Clutches

• DT750 has added clutches for added clutch holding capacity
• The factory Allison has 12 C1 clutches. The DT750 has 16
• The factory Allison has 6 C2 clutches. The DT750 has 7
• The factory Allison has 4 C3 clutches. The DT750 has 6
• The factory Allison has 5 C4 clutches. The DT750 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 speed and quality  

Upgraded Billet Torque Converter

• Goerend X, Billet Triple Disc
• Able to hold up to 1,400Hp and 2,000ftlbs of torque 
• Designed to rotate smoother when coupled 
• Forged front cover and clutch pistons
• Reduces porosity and increases durability
• Billet Stator that is guaranteed to never break 
• Patented design insures torque converter clutch lock up timing
• Smooth consistent lock-up
• Superior strength to stock
• 1800 - 1900 RPM Stall Speed
• Perfect stall speed for towing and daily driving
• Provides reliability for increased power levels

Upgraded Transmission Case

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