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APPLICATION: Fit for 1998-2004 LS based engines including all 4.8, 5.3, 5.7, 6.0, 6.2, 7.0 using a TH350, TH400, Powerglide or 700R4 transmission. FUNCTION: When installing a Th350 or Th400 behind a LS engine while using a curved flywheel you'll need this adapter spacer.
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