ATS Diesel 305-900-4248 SFI Billet Flexplate Allison 1000 for 2001-2019 GM 6.6L

Vehicle Fitment

• 2001-2010 Chevrolet Silverado 2500HD (All Trims, 6.6L V8 Duramax Diesel LB7/LLY/LBZ/LMM, Allison LCT-1000 Transmission, 2WD / 4WD)
• 2001-2010 Chevrolet Silverado 3500HD (All Trims, 6.6L V8 Duramax Diesel LB7/LLY/LBZ/LMM, Allison LCT-1000 Transmission, 2WD / 4WD)
• 2001-2010 GMC Sierra 2500HD (All Trims, 6.6L V8 Duramax Diesel LB7/LLY/LBZ/LMM, Allison LCT-1000 Transmission, 2WD / 4WD)
• 2001-2010 GMC Sierra 3500HD (All Trims, 6.6L V8 Duramax Diesel LB7/LLY/LBZ/LMM, Allison LCT-1000 Transmission, 2WD / 4WD)
• 2006-2010 Chevrolet Express 2500 / 3500 (6.6L V8 Duramax Diesel, Allison LCT-1000 Transmission)

Fitment Notes

• Compatible with Allison LCT-1000 / LCT-2000 / LCT-2400 transmissions
• Compatible with stock and aftermarket torque converters
• Crankshaft alignment pin must be installed during fitment - ensures proper counterbalance alignment and prevents bearing failure
• Multi-step torque procedure required: torque crankshaft bolts to 58 ft-lbs in sequence, then an additional 60 degrees in sequence
• Transmission removal required for installation

Features

• SFI 29.3 certified - meets the toughest race and competition application standards
• Billet steel construction handles significantly higher torque loads than the factory flexplate
• Eliminates the cracking common on stock flexplates under high-power and heavy towing conditions
• Compatible with stock and aftermarket Allison torque converters
• Precision machined for exact OEM crankshaft bolt pattern fitment
• Allows faster, harder transmission shifts without risk of flexplate failure

Specifications

• Material: Billet steel
• SFI Rating: SFI 29.3 certified
• Compatible Transmissions: Allison LCT-1000 / LCT-2000 / LCT-2400
• Crankshaft Bolt Torque: 58 ft-lbs + 60° additional (multi-step sequence)
• Shipping Weight: 20 lbs
• Warranty: 5 Year / 500,000 Miles

Included Components

• 1x ATS Billet Steel Flexplate (Allison LCT-1000, SFI 29.3 Certified)

Product Description

The ATS Diesel 305-900-4248 is an SFI 29.3-certified billet steel flexplate for 2001-2010 GM Silverado and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel and Allison LCT-1000 automatic transmission. As horsepower and torque increase through performance modifications or heavy towing loads, the factory flexplate becomes a liability - cracking and shattering under the extreme loads that high-output Duramax engines generate.

Precision machined from billet steel and SFI race-certified, this flexplate is engineered to handle sustained high-torque conditions that destroy stock units. It's compatible with both stock and aftermarket Allison torque converters, making it an ideal upgrade alongside any performance transmission build. Backed by ATS's 5-year / 500,000-mile warranty, it delivers the confidence needed for towing, competition, and high-performance street applications.