Since 1952
America's Oldest Speed Shop ®
Speedway Motors Bill Smith
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LS1 to TH350 Flexplate Kit
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If you want to bolt a TH350/TH400 up to your LS1 based engine, you need this kit. The spacer properly positions the flexplate and supports the converter hub. Includes flexplate, spacer and special bolts.
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    TCI Automotive 399753 LS1 Engine to GM Auto Transmission Adapter
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    If you want to bolt a TH350, TH400 and 700R4 transmission up to your LS-Series engine, you need this kit. The spacer properly positions the flexplate and supports the converter hub. For Turbo 350, Turbo 400, and 700R4 transmission application.

    SFI 29.1 approved. Dual bolt patterns: stock LS-Series and small GM bolt pattern.

    Kit includes:

    • dual bolt pattern SFI rated flexplate
    • flexplate spacer
    • flexplate to crankshaft bolts
    • instructions