LS engine with th400 flexplate?
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http://www.summitracing.com/parts/hup-hp3795 hope this helps you should be ok with the factory flex plate from what I understand. Some one correct me if I'm wrong.
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LS flexplate but you need to use a spacer like shown above....if you have a flat LS flexplate you need a different spacer that bolts to the crank then you bolt the fp to it but if you have the dished LS fp you can use the one above from hughes, it goes between the the fp and the tc
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You will have to use the GM spacer with the flexplate. And yes it should work with any LS bolting to a TH trans. Watch out for the early motors with the extended crank. And its SFI approved. IIRC it cost me around $140. Eric L