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Tci Auto

TCI Machined 168-Tooth Flexplate 399754 Flexplate, 168-tooth, Steel, Internal Engine Balance, SFI 29.1, TH400/4L80E, Chevy LS, Each

SKU: TCI399754

Flexplates
TCI Machined 168-Tooth Flexplate 399754 Flexplate, 168-tooth, Steel, Internal Engine Balance, SFI 29.1, TH400/4L80E, Chevy LS, Each

Tci Auto

TCI Machined 168-Tooth Flexplate 399754 Flexplate, 168-tooth, Steel, Internal Engine Balance, SFI 29.1, TH400/4L80E, Chevy LS, Each

SKU: TCI399754

Flexplates
A$862.64
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

IMPORTANT NOTICE: Flexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.

For serious performance, TCI machined SFI-approved flexplates are a "must have". These .140 in. thick flexplates are constructed of A514 Blanchard ground steel and are SFI 29.1 approved. TCI offers a complete line of Chrysler and Ford flexplates with GM and Ford bolt patterns for use with their adapter plate kits as well as neutral balanced flexplates with 168-tooth and 166-tooth starter rings for Chevy and Pontiac applications. Now you can speed down the track with the confidence of TCI machined SFI-approved flexplates.

Part Type

SFI Flexplate GM LS Wide Converter Bolt Patt

Data: v4.2 - Upd: 2026-10-21 22:05:18

Specifications

Product Attributes - Brand
TCI Auto
Product Attributes - Manufacturer's Part Number
399754
Product Attributes - Part Type
Flexplates
Product Attributes - Product Line
TCI Machined Flexplates
Product Attributes - UPC
788120043502
Product Attributes - Ring Gear Tooth Quantity
168-tooth
Product Attributes - Flexplate Diameter (in.)
14.00
Product Attributes - Engine Balance
Internal
Product Attributes - Flexplate Material
Steel
Product Attributes - SFI Rating
SFI 29.1
Product Attributes - Marine Use
No
Product Attributes - Quantity
Sold individually.
Product Attributes - Notes
Flexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.

Reference Information

Brand Name/s Tci Auto
StreetFX SKU tci399754
SFX Item ID 5057982
Supplier Item Code 5057982
Manufacturer SKU 399754
Manufacturer UPC 788120043502
Alternative References 168-Tooth, TH400/4L80E

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1998
    Ending Year2004
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size5.7L/350
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer Code4L80-E
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year1998
    Ending Year2004
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size5.7L/350
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer CodeTHM400
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2017
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size4.8L/294
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer Code4L80-E
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2017
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size4.8L/294
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer CodeTHM400
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2001
    Ending Year2014
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size5.3L/325
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer Code4L80-E
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2001
    Ending Year2014
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size5.3L/325
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer CodeTHM400
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2001
    Ending Year2019
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size6.0L/364
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer Code4L80-E
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2001
    Ending Year2019
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size6.0L/364
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer CodeTHM400
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2006
    Ending Year2015
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size7.0L/427
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer Code4L80-E
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2006
    Ending Year2015
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size7.0L/427
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer CodeTHM400
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2008
    Ending Year2017
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size6.2L/376
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer Code4L80-E
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.
  • MakeCHEVROLET
    Beginning Year2008
    Ending Year2017
    Engine TypeV8
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Engine Size6.2L/376
    Converter Bolt Pattern11.500 in.
    Crankshaft to Flywheel/Flexplate Attachment6-bolt
    Transmission Manufacturer CodeTHM400
    Application NotesFlexplate to crank bolts and pilot hub adapter included. This flexplate is designed for use when bolting a GM LS-based motor to a 4L80E and utilizes the 6-bolt mounting pattern. This flexplate is drilled with a 11.50 in. bolt pattern. Since the crank spacer is built in, this will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange and came with flat flexplate. This will not fit 1999-2000 4.8L applications that originally came with a manual transmission.

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