Notes1.Fits for 1997-07 GM LS1/LS6 engines (up to '09 for LS2) and 4.8/5.3/6.0 truck engines including L33, L59, LM4, LM7, LQ4, LQ9, and LR4. Adapts all of these engines to TH350, 700R-4, 200-4R, 4L60 and Powerglide transmissions that originally came behind a non-LS engine(such as a SBC or BBC V8).2.May not work with some 1999-2000 LQ4 6.0 LS engines, specifically ones that came with a 4L80E automatic as they require a flat flexplate due to the tall crank flange. Description:Make your Gen III LS swap a breeze with this flexplate adapter for GM automatic transmission. These platinum series flexplates are engineered to handle extreme duty applications and designed to take the punishment of today's high horsepower Gen III engines. The 4mm thick centerplate provides a solid foundation (that's 0.035 thicker than stock). Ring gears are precision welded to meet SFI 29.1 specifications, utilizing robotic cold-welding processes. These flex plates are inspected throughout the manufacturing cycle to ensure a high quality, safe end product. SFI 29.1 certifiedDirect bolt on for Gen III LS engines w/ short crank flangeAdapts to GM TH350/700R4/2004R/4L60/Powerglide transmissionsWorks with 10.75 & 11.066 (11.1 ) bolt-pattern torque convertersConstructed from cold-rolled premium steel0.035 thicker than stock flexplatesLong lasting gold iridited finish prevents rustForged 1-piece steel ring gear w/ 168 teethFeatures double welded ring gears for added durabilityWorks with factory LS starter motor Vehicle Fitment: Our adapter flexplate is compatible with GM TH350/700R4/2004R/4L60/Powerglide transmissions with Gen III LS engines Function: Works with the factory LS starter,this adapter flexplate is designed for reducing conversion costs by utilizing existing components SFI 29.1 Certified: Ring gears are precision welded to meet SFI 29.1 specifications, utilizing robotic cold-welding processes Package Include: 1 x Flex Plate High-quality: Constructed from cold-rolled premium steel， 0.035 thicker than stock flexplates ASIN B0DQ4X7LVZ Brand STILEALUS Model flexplate Exterior Machined Item Weight 7.28 pounds Manufacturer EST Auto Part Item model number LSOT00142 Package Dimensions 14.5 x 14.25 x 1 inches Manufacturer Part Number LSOT00142