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  1. Home
  2. GM Duramax
  3. 2007.5-2010 GM Duramax 6.6L LMM
  4. Transmission Upgrades

2007.5-2010 GM Duramax 6.6L LMM Transmission Upgrades

Slapping on performance modifications onto your 2007.5-2010 GM 6.6L Duramax LMM means your transmission will start to feel the strain of increased horsepower and torque to your truck's entire drivetrain. Our premium transmission upgrades for your GM 2500/3500 truck ensures your transmission stays in one place when you add on a ton power for improved drivability and towing capability. Here at Alligator Performance, we offer transmission upgrades such as transmission pans, torque converters, flex plates, modules, and even complete transmissions to give your 6.6L Duramax consistent performance you can count on! GM Duramax Fitments: 2007, 2009, 2010 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.

GM Duramax>2007.5-2010 6.6L LMM
  • Transmission Pans Transmission Pans
  • Torque Converters Torque Converters
  • Flex Plates Flex Plates
  • Modules Modules
  • Complete Transmissions Complete Transmissions

Products [54]

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Item In Cart 01-16 GM 2500/3500HD 6.6L Duramax BD Xtrude Auxiliary Transmission Oil Cooler with Fan Kit
01-16 GM 2500/3500HD 6.6L Duramax BD Xtrude Auxiliary Transmission Oil Cooler with Fan Kit
In Stock. Ships in 1 Business Day!
$659.95 $593.96 Sale
View Details
Item In Cart BD Xtrude Double Stacked Auxiliary Transmission Cooler with Fan and 1/2
BD Xtrude Double Stacked Auxiliary Transmission Cooler with Fan and 1/2" Lines
In Stock. Ships in 1 Business Day!
$959.95 $863.96 Sale
View Details
Item In Cart 06-10 GM 6.6L Duramax 2500HD / 3500HD  Deviant 1/2
06-10 GM 6.6L Duramax 2500HD / 3500HD Deviant 1/2" Transmission Cooler Repair Lines
In Stock. Ships in 1 Business Day!
(2)
$220.00 $198.00 Sale
View Details
Item In Cart 06-10 GM 6.6L Duramax 2500HD / 3500HD  Deviant 5/8
06-10 GM 6.6L Duramax 2500HD / 3500HD Deviant 5/8" Transmission Cooler Repair Lines
In Stock. Ships in 1 Business Day!
$265.00 $238.50 Sale
View Details
Item In Cart 01-19 GM 2500/3500HD 6.6L Duramax PPE 128060000 Allison Transmission PTO Side Plate Cover -Raw Finish
01-19 GM 2500/3500HD 6.6L Duramax PPE 128060000 Allison Transmission PTO Side Plate Cover -Raw Finish
In Stock. Ships in 1 Business Day!
$71.99
View Details
Item In Cart 07.5-10 GM 2500/3500HD 6.6L Duramax LMM PPE Transfer Case Brace
07.5-10 GM 2500/3500HD 6.6L Duramax LMM PPE Transfer Case Brace
- Ships from Manufacturer in 3-5 Business Days
$134.99
View Details
Item In Cart Merchant 10075 Allison 1000 Internal Filter W Spin On Combo | 01-10 GM 6.6L Duramax 2500HD / 3500HD
Merchant 10075 Allison 1000 Internal Filter W Spin On Combo | 01-10 GM 6.6L Duramax 2500HD / 3500HD
In Stock. Ships in 1 Business Day!
$41.45
View Details
Item In Cart Merchant 10195 Transmission Rear Housing Support | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD
Merchant 10195 Transmission Rear Housing Support | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD
In Stock. Ships in 1 Business Day!
$143.99
View Details
Item In Cart 01-19 GM 2500/3500HD 6.6L Duramax Merchant 22110 Flywheel Lock
01-19 GM 2500/3500HD 6.6L Duramax Merchant 22110 Flywheel Lock
In Stock. Ships in 1 Business Day!
$16.95
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Item In Cart 01-10 GM 2500/3500HD 6.6L Duramax Merchant Allison Transmission Internal Shallow Filter
01-10 GM 2500/3500HD 6.6L Duramax Merchant Allison Transmission Internal Shallow Filter
In Stock. Ships in 1 Business Day!
$27.00
View Details
Item In Cart Randys Transmissions 311241033 Stage 3 Allison 1000 Transmission 900HP Max | 01-19 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241033 Stage 3 Allison 1000 Transmission 900HP Max | 01-19 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$7,995.00
View Details
Item In Cart Randys Transmissions 311241035 Stage 4 Allison 1000 Transmission 900+HP Max | 01-19 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241035 Stage 4 Allison 1000 Transmission 900+HP Max | 01-19 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$9,995.00
View Details
Item In Cart Randys Transmissions 311241030 Stage 1 Allison 1000 Transmission | 01-17 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241030 Stage 1 Allison 1000 Transmission | 01-17 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$4,795.00
View Details
Item In Cart Randys Transmissions 311241031 Stage 2 Allison 1000 Transmission 700HP Max | 01-19 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241031 Stage 2 Allison 1000 Transmission 700HP Max | 01-19 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$6,995.00
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Item In Cart SunCoast 37710-12L Deep Filter w/Lock & Spin-On Transmission Filter | 01-16 GM 6.6L Duramax 2500HD / 3500HD
SunCoast 37710-12L Deep Filter w/Lock & Spin-On Transmission Filter | 01-16 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$76.00
View Details
Item In Cart 04-19 GM 2500HD / 3500HD 6.6L Duramax SunCoast Allison Transmission Shallow Filter 515482
04-19 GM 2500HD / 3500HD 6.6L Duramax SunCoast Allison Transmission Shallow Filter 515482
- Ships in 3-5 Business Days
$17.00
View Details
Item In Cart 04-19 GM 2500HD / 3500HD 6.6L Duramax  SunCoast Allison Transmission Deep Filter 515483
04-19 GM 2500HD / 3500HD 6.6L Duramax SunCoast Allison Transmission Deep Filter 515483
In Stock. Ships in 1 Business Day!
$17.00
View Details
Item In Cart 06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
- Ships in 3-5 Business Days
$1,055.00
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Item In Cart 01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Allison Billet Triple Disc 2600 Stall Torque Converter
01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Allison Billet Triple Disc 2600 Stall Torque Converter
- Ships in 3-5 Business Days
$1,755.00
View Details
Item In Cart 01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Allison Billet Triple Disc 3000-4000 Stall Torque Converter
01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Allison Billet Triple Disc 3000-4000 Stall Torque Converter
- Ships in 3-5 Business Days
$1,755.00
View Details
Item In Cart 01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Billet Triple Disc 2200-2400 Stall Torque Converter
01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Billet Triple Disc 2200-2400 Stall Torque Converter
- Ships in 3-5 Business Days
$1,815.00
View Details
Item In Cart Suncoast GM-1055-3D 2300-2400 Stall Triple Disk | 01-16 GM Allison 1000
Suncoast GM-1055-3D 2300-2400 Stall Triple Disk | 01-16 GM Allison 1000
- Ships in 3-5 Business Days
$1,570.00
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Item In Cart 01-19 GM 2500/3500HD 6.6L Duramax PPE High Efficiency Spin-On Allison Transmission Fluid Filter
01-19 GM 2500/3500HD 6.6L Duramax PPE High Efficiency Spin-On Allison Transmission Fluid Filter
- Ships from Manufacturer in 3-5 Business Days
$17.99
View Details
Item In Cart 06-10 GM 2500/3500HD 6.6L Duramax PPE Allison Performance Transmission Cooler
06-10 GM 2500/3500HD 6.6L Duramax PPE Allison Performance Transmission Cooler
In Stock. Ships in 1 Business Day!
$350.99
View Details
Item In Cart 07.5-10 GM 2500/3500HD 6.6L Duramax LMM 4WD Suncoast Guardian Transmission with Converter Package
07.5-10 GM 2500/3500HD 6.6L Duramax LMM 4WD Suncoast Guardian Transmission with Converter Package
- Ships in 3-5 Business Days
$6,995.00
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Item In Cart 01-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Billet Allison Single Disc 2000 Stall Guardian Series Torque Converter
01-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Billet Allison Single Disc 2000 Stall Guardian Series Torque Converter
Call 208-719-7400 for Availability!
$1,195.00
View Details
Item In Cart 06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Category 0 Allison Refresh Kit without Converter
06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Category 0 Allison Refresh Kit without Converter
Call 208-719-7400 for Availability!
$1,295.00
View Details
Item In Cart 11-16 GM 2500 / 3500HD 6.6L Duramax Suncoast Category 0 Allison Refresh Kit without Converter
11-16 GM 2500 / 3500HD 6.6L Duramax Suncoast Category 0 Allison Refresh Kit without Converter
Call 208-719-7400 for Availability!
$1,295.00
View Details
Item In Cart 06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Category 1 500HP Capable Transmission Rebuild Kit without Converter
06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Category 1 500HP Capable Transmission Rebuild Kit without Converter
Call 208-719-7400 for Availability!
$2,100.00
View Details
Item In Cart Wehrli WCF100135 Allison 4x4 Transfer Case Brace | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD  LMM
Wehrli WCF100135 Allison 4x4 Transfer Case Brace | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD LMM
- Built to order. 10-15 business day lead time.
$154.00
View Details
Item In Cart Cognito 110-90278 Allison Transmission Bracket | 05-19 GM 6.6L Duramax 2500HD / 3500HD
Cognito 110-90278 Allison Transmission Bracket | 05-19 GM 6.6L Duramax 2500HD / 3500HD
- Call 208-719-7400 for Availablity
$54.95
View Details
Item In Cart 01-16 GM 6.6L Duramax 2500HD / 3500HD  SunCoast Allison Category 1 Torque Converter
01-16 GM 6.6L Duramax 2500HD / 3500HD SunCoast Allison Category 1 Torque Converter
- Ships in 3-5 Business Days
$1,395.00
View Details
Item In Cart ATS 3019004248 Allison Deep Transmission Pan | 01-18 GM 6.6L Duramax 2500HD / 3500HD
ATS 3019004248 Allison Deep Transmission Pan | 01-18 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$372.75
View Details
Item In Cart 01-10 GM 6.6L Duramax 2500HD / 3500HD  Merchant Transmission Mount
01-10 GM 6.6L Duramax 2500HD / 3500HD Merchant Transmission Mount
In Stock. Ships in 1 Business Day!
$65.00
View Details
Item In Cart 01-18 GM 6.6L Duramax 2500HD / 3500HD  Mag Hytec Allison Transmission Pan
01-18 GM 6.6L Duramax 2500HD / 3500HD Mag Hytec Allison Transmission Pan
In Stock. Ships in 1 Business Day!
$334.40
View Details
Item In Cart 01-19 GM 6.6L Duramax 2500HD / 3500HD  PPE Deep Transmission Pan
01-19 GM 6.6L Duramax 2500HD / 3500HD PPE Deep Transmission Pan
In Stock. Ships in 1 Business Day!
$332.99
View Details
Item In Cart Deviant 74400 Stage 1 Street Allison Transmission | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD  LMM
Deviant 74400 Stage 1 Street Allison Transmission | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD LMM
- Ships in 3-5 Business Days
$5,000.00
View Details
Item In Cart ATS 3109003000 Auxiliary Transmission Cooler Kit With 3/8 Inch Lines
ATS 3109003000 Auxiliary Transmission Cooler Kit With 3/8 Inch Lines
- Ships from Manufacturer in 1-2 Business Days
$427.45
View Details
Item In Cart ATS 3109002000 Auxiliary Transmission Cooler Kit With 1/2 Inch Lines
ATS 3109002000 Auxiliary Transmission Cooler Kit With 1/2 Inch Lines
In Stock. Ships in 1 Business Day!
$427.45
View Details
Item In Cart ATS 3098144332 Stage 1 Allison LCT1000 Crate Transmission | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD  LMM 4WD
ATS 3098144332 Stage 1 Allison LCT1000 Crate Transmission | 07.5-10 GM 6.6L Duramax 2500HD / 3500HD LMM 4WD
- Ships from Manufacturer in 3-4 Weeks
$5,363.95
View Details
Item In Cart Fleece FPE-ALL-PTO-CVR Billet Allison PTO Covers | 01-17 GM 6.6L Duramax 2500HD / 3500HD
Fleece FPE-ALL-PTO-CVR Billet Allison PTO Covers | 01-17 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$99.00
View Details
Item In Cart Deviant 77400 Allison 1000 Billet PTO Covers | 01-19 GM 6.6L Duramax 2500HD / 3500HD
Deviant 77400 Allison 1000 Billet PTO Covers | 01-19 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$79.99 $71.99 Sale
View Details
Item In Cart 06-10 GM 6.6L Duramax 2500HD / 3500HD  Fleece 5/8
06-10 GM 6.6L Duramax 2500HD / 3500HD Fleece 5/8" Allison Transmission Cooler Lines
In Stock. Ships in 1 Business Day!
$269.00
View Details
Item In Cart ATS 3139054308 Allison Stage 5 Rebuild Kit | 06-10 GM 6.6L Duramax 2500HD / 3500HD
ATS 3139054308 Allison Stage 5 Rebuild Kit | 06-10 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$2,994.25
View Details
Item In Cart ATS 3139064308 Allison Stage 6 Rebuild Kit | 06-10 GM 6.6L Duramax 2500HD / 3500HD
ATS 3139064308 Allison Stage 6 Rebuild Kit | 06-10 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$3,298.75
View Details
Item In Cart ATS 3109012000 Thermostat For Auxiliary Transmission Cooler With 1/2 Inch Lines
ATS 3109012000 Thermostat For Auxiliary Transmission Cooler With 1/2 Inch Lines
In Stock. Ships in 1 Business Day!
$72.91
View Details
Item In Cart ATS 3140054272 Allison Late Cooler Line Fitting | 03-16 GM 6.6L Duramax 2500HD / 3500HD
ATS 3140054272 Allison Late Cooler Line Fitting | 03-16 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$35.00
View Details
Item In Cart ATS 3139944248 Allison C4 Clutch Pack | 01-10 GM 6.6L Duramax 2500HD / 3500HD
ATS 3139944248 Allison C4 Clutch Pack | 01-10 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$167.48
View Details
Item In Cart ATS 3088054248 Allison C5 Clutch Pack | 01-10 GM 6.6L Duramax 2500HD / 3500HD
ATS 3088054248 Allison C5 Clutch Pack | 01-10 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$304.50
View Details
Item In Cart ATS 3049304248 Allison Billet Output Shaft | 01-18 GM 6.6L Duramax 2500HD / 3500HD
ATS 3049304248 Allison Billet Output Shaft | 01-18 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$750.00
View Details
Item In Cart ATS 3049204248 Allison Billet Intermediate Shaft | 01-19 GM 6.6L Duramax 2500HD / 3500HD
ATS 3049204248 Allison Billet Intermediate Shaft | 01-19 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$495.00
View Details
Item In Cart ATS 3049104248 Allison Billet Input Shaft | 01-16 GM 6.6L Duramax 2500HD / 3500HD
ATS 3049104248 Allison Billet Input Shaft | 01-16 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$793.00
View Details
Item In Cart ATS 3039044308 Allison Trim Valve Kit | 06-10 GM 6.6L Duramax 2500HD / 3500HD
ATS 3039044308 Allison Trim Valve Kit | 06-10 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$154.50
View Details
Item In Cart ATS 3039004308 Allison Performance Valve Body | 06-10 GM 6.6L Duramax 2500HD / 3500HD
ATS 3039004308 Allison Performance Valve Body | 06-10 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-4 Weeks
$857.68
View Details
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  • Duramax
    • 2020-2022 Duramax L5P
      • Engine Upgrades
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    • 2017-2019 Duramax L5P
      • Engine Upgrades
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    • 2011-2016 Duramax LML
      • Engine Upgrades
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    • 2007.5-2010 Duramax LMM
      • Engine Upgrades
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    • 2006-2007 Duramax LBZ
      • Engine Upgrades
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    • 2004.5-2005 Duramax LLY
      • Engine Upgrades
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    • 2001-2004 Duramax LB7
      • Engine Upgrades
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  • Powerstroke
    • 2020-2022 6.7L Powerstroke
      • Engine Upgrades
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    • 2017-2019 6.7L Powerstroke
      • Engine Upgrades
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    • 2011-2016 6.7L Powerstroke
      • Engine Upgrades
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    • 2008-2010 6.4L Powerstroke
      • Engine Upgrades
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    • 2003-2007 6.0L Powerstroke
      • Engine Upgrades
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  • Cummins
    • 2019-2022 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
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    • 2013-2018 6.7L Cummins
      • Engine Upgrades
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    • 2010-2012 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
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    • 2007.5-2009 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
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    • 2004.5-2007 5.9L Cummins
      • Engine Upgrades
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    • 2003-2004 5.9L Cummins
      • Engine Upgrades
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