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  1. Home
  2. GM Duramax
  3. 2004.5-2005 GM Duramax 6.6L LLY
  4. Transmission Upgrades

2004.5-2005 GM Duramax 6.6L LLY Transmission Upgrades

Once you've installed various performance modifications on your GM 6.6L Duramax LLY, chances are your transmission will have trouble compensating for the elevated levels of both horsepower and torque your Sierra/Silverado is throwing down. Here at Alligator Performance, our high-quality transmission upgrades and accessories will ensure your transmission stays in one place after adding on tons of power and performance. We offer transmission upgrades including transmission pans, torque converters, flex plates, modules, and even complete transmissions to give your 6.6L Duramax LLY consistent performance you can count on! GM Duramax Fitments: 2004, 2005 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>2004.5-2005 6.6L LLY
  • Transmission Pans Transmission Pans
  • Torque Converters Torque Converters
  • Flex Plates Flex Plates
  • Modules Modules
  • Complete Transmissions Complete Transmissions

Products [63]

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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
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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
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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
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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
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Item In Cart 03-05 GM 2500/3500HD 6.6L Duramax BD Allison Tap Shifter Kit
03-05 GM 2500/3500HD 6.6L Duramax BD Allison Tap Shifter Kit
- Ships from Manufacturer in 1-2 Business Days
$431.95
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Item In Cart 03-05 GM 2500/3500HD 6.6L Duramax Fleece Allison Tapshifter
03-05 GM 2500/3500HD 6.6L Duramax Fleece Allison Tapshifter
In Stock. Ships in 1 Business Day!
$349.99
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Item In Cart Fleece FPE-TAPSHIFTER-KDTK 5 Speed Allison Tapshifter | 01-05 GM 6.6L Duramax 2500HD / 3500HD  Kodiak/TopKick
Fleece FPE-TAPSHIFTER-KDTK 5 Speed Allison Tapshifter | 01-05 GM 6.6L Duramax 2500HD / 3500HD Kodiak/TopKick
- Ships in 3-5 Business Days
$349.99
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Item In Cart 01-05 GM 6.6L Duramax 2500HD / 3500HD  Fleece 5/8
01-05 GM 6.6L Duramax 2500HD / 3500HD Fleece 5/8" Allison Transmission Cooler Lines
In Stock. Ships in 1 Business Day!
$269.00
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Item In Cart Fleece FPE-TL-ST 2 Setrab To -10AN Fittings Purchased W/Allison Transmission Cooler Lines
Fleece FPE-TL-ST 2 Setrab To -10AN Fittings Purchased W/Allison Transmission Cooler Lines
In Stock. Ships in 1 Business Day!
$19.99
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Item In Cart 01-05 GM 6.6L Duramax 2500HD / 3500HD  Deviant High Performance Transmission Cooler Repair Lines
01-05 GM 6.6L Duramax 2500HD / 3500HD Deviant High Performance Transmission Cooler Repair Lines
- Ships in 3-5 Business Days
$285.00 $256.50 Sale
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Item In Cart 01-05 GM 6.6L Duramax 2500HD / 3500HD  Deviant 1/2
01-05 GM 6.6L Duramax 2500HD / 3500HD Deviant 1/2" Transmission Cooler Repair Lines
- Ships in 3-5 Business Days
$235.00 $211.50 Sale
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Item In Cart 03-05 GM 6.6L Duramax 2500HD / 3500HD  PPE Transmission Cooler
03-05 GM 6.6L Duramax 2500HD / 3500HD PPE Transmission Cooler
In Stock. Ships in 1 Business Day!
$296.99
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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
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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
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Item In Cart 2001-2007 GM 6.6L Duramax w/ Allison Transmission PPE Transfer Case Brace
2001-2007 GM 6.6L Duramax w/ Allison Transmission PPE Transfer Case Brace
In Stock. Ships in 1 Business Day!
$134.99
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Item In Cart 01-06 GM 2500/3500HD 6.6L Duramax PPE HD Transfer Case Pump Housing Upgrade Kit (Pump Rub Kit)
01-06 GM 2500/3500HD 6.6L Duramax PPE HD Transfer Case Pump Housing Upgrade Kit (Pump Rub Kit)
In Stock. Ships in 1 Business Day!
$62.99
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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
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Item In Cart Merchant 10186 Transmission Rear Housing Support | 01-07 GM 6.6L Duramax 2500HD / 3500HD
Merchant 10186 Transmission Rear Housing Support | 01-07 GM 6.6L Duramax 2500HD / 3500HD
In Stock. Ships in 1 Business Day!
$134.99
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Item In Cart 01-07 GM 6.6L Duramax 2500HD / 3500HD  Merchant Transfer Case Pump Combo
01-07 GM 6.6L Duramax 2500HD / 3500HD Merchant Transfer Case Pump Combo
- Ships in 3-5 Business Days
$474.95
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Item In Cart 01-07 GM 2500/3500HD 6.6L Duramax LB7/LLY/LBZ Merchant Right Hand Allison Dipstick Tube
01-07 GM 2500/3500HD 6.6L Duramax LB7/LLY/LBZ Merchant Right Hand Allison Dipstick Tube
- Ships in 3-5 Business Days
$27.95
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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 Merchant 29541852 Allison Nsbu Switch | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD
Merchant 29541852 Allison Nsbu Switch | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$115.00
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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
- Ships in 3-5 Business Days
$27.00
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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
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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
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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
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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
In Stock. Ships in 1 Business Day!
$76.00
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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
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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
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Item In Cart SunCoast A1-6VB-TCM-LLY Allison 5-6 Speed Conversion | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY
SunCoast A1-6VB-TCM-LLY Allison 5-6 Speed Conversion | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY
- Ships in 3-5 Business Days
$2,455.00
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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
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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
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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
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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
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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
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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 South Bend SDDMAXY-ORG Organic Street Dual Disc Clutch | 01-05 GM 6.6L Duramax 2500HD / 3500HD
South Bend SDDMAXY-ORG Organic Street Dual Disc Clutch | 01-05 GM 6.6L Duramax 2500HD / 3500HD
In Stock. Ships in 1 Business Day!
$1,338.60
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Item In Cart 01-05 GM 2500/3500 6.6L Duramax LB7 / LLY South Bend Organic Clutch Kit SDM0105OK
01-05 GM 2500/3500 6.6L Duramax LB7 / LLY South Bend Organic Clutch Kit SDM0105OK
In Stock. Ships in 1 Business Day!
$1,003.95
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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
In Stock. Ships in 1 Business Day!
$54.95
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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
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Item In Cart 01-07 GM 6.6L Duramax 2500HD / 3500HD  Wehrli Allison Transfer Case Brace
01-07 GM 6.6L Duramax 2500HD / 3500HD Wehrli Allison Transfer Case Brace
- Ships in 25-30 Business Day Lead Time.
$154.00
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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
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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
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Item In Cart ATS 3139214248 Allison Master Rebuild Kit | 01-05 GM 6.6L Duramax 2500HD / 3500HD
ATS 3139214248 Allison Master Rebuild Kit | 01-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$1,725.50
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Item In Cart ATS 3139074290 Allison Stage 7 Rebuild Kit | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY
ATS 3139074290 Allison Stage 7 Rebuild Kit | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY
- Ships from Manufacturer in 1-2 Business Days
$4,308.68
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Item In Cart ATS 3139064290 Allison Stage 6 Rebuild Kit | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY
ATS 3139064290 Allison Stage 6 Rebuild Kit | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY
- Ships from Manufacturer in 1-2 Business Days
$3,298.75
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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
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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
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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
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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
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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
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Item In Cart ATS 3039044248 Allison Trim Valve Kit | 01-05 GM 6.6L Duramax 2500HD / 3500HD
ATS 3039044248 Allison Trim Valve Kit | 01-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$154.50
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Item In Cart ATS 3039004272 Allison Performance Valve Body | 03-05 GM 6.6L Duramax 2500HD / 3500HD
ATS 3039004272 Allison Performance Valve Body | 03-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-4 Weeks
$857.68
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Item In Cart ATS 3030104290 Allison Pressure Regulator Valve | 04-05 GM 6.6L Duramax 2500HD / 3500HD  LLY
ATS 3030104290 Allison Pressure Regulator Valve | 04-05 GM 6.6L Duramax 2500HD / 3500HD LLY
- Ships from Manufacturer in 1-2 Business Days
$109.42
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Item In Cart 01-05 GM 2500/3500HD 6.6L Duramax LB7 / LLY DuramaxTuner Allison Transmission 6 Speed Conversion Kit
01-05 GM 2500/3500HD 6.6L Duramax LB7 / LLY DuramaxTuner Allison Transmission 6 Speed Conversion Kit
- Ships in 3-5 Business Days
$1,875.00
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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
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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
In Stock. Ships in 1 Business Day!
$17.99
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Item In Cart 04.5-05 GM 2500/3500HD 6.6L Duramax LLY 4WD Suncoast Guardian Transmission with Converter Package
04.5-05 GM 2500/3500HD 6.6L Duramax LLY 4WD Suncoast Guardian Transmission with Converter Package
- Ships in 3-5 Business Days
$6,995.00
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Item In Cart 01-05 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
01-05 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 01-10 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
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Item In Cart 01-05 GM 2500 / 3500HD 6.6L Duramax Suncoast Category 0 Allison Refresh Kit without Converter
01-05 GM 2500 / 3500HD 6.6L Duramax Suncoast Category 0 Allison Refresh Kit without Converter
Call 208-719-7400 for Availability!
$1,295.00
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Item In Cart 01-05 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Category 1 500HP Capable Transmission Rebuild Kit without Converter
01-05 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
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