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th400 to ls1 converter flexplate problems

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Old 02-20-2010, 04:58 PM
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Default th400 to ls1 converter flexplate problems
i bought a tci flexplate 399753 and i have a ptc converter, the bolt spacing on the converter is more spread out then the flexplate. what do i need?
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Old 02-20-2010, 08:18 PM
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Originally Posted by bad6as
i bought a tci flexplate 399753 and i have a ptc converter, the bolt spacing on the converter is more spread out then the flexplate. what do i need?
Have you tried both patterns on the flywheel? There are 2 bolt patterns on that flywheel/flexplate.
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Old 02-20-2010, 08:59 PM
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Your going to need the 399754 flexplate. I have the 399753 and it fits 10.75 and 11.00 converters
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Old 02-21-2010, 01:39 AM
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so that means i have a what size converter
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Old 02-21-2010, 03:46 PM
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The wide bolt pattern. Measure from the bolt circle to the middle and times that number x2.
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Old 02-21-2010, 06:48 PM
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center of the bolt hole to center of bolt hole is 10"
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Old 02-22-2010, 06:28 PM
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Don't measure bolt hole to bolt hole. Measure the bolt hole to the center of the converter and times that measurement x2
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Old 02-22-2010, 06:57 PM
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Exactly what Gee101 said. Here is a pic of what he is explaining:

edit: please ignore the diameter symbols on there. It's the distance x 2. For some reason I had diameter stuck in my head.

Last edited by BlackDuk98; 02-22-2010 at 07:40 PM.
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Old 02-22-2010, 08:07 PM
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ok i think if i remember right the center hole of the converter tab to the center of the converter was about 5.5" so that would make 11"
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Old 02-22-2010, 10:34 PM
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its 5 3/4 just got home and mesured, so what flex plate do i need
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Old 02-24-2010, 08:28 PM
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The one I suggested in the 3rd post
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Old 02-24-2010, 08:49 PM
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Originally Posted by bad6as
its 5 3/4 just got home and mesured, so what flex plate do i need
how much do u want to sell that flexplate for ??? Glad to see youf found the problem too
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Old 02-24-2010, 09:22 PM
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sold mine for 180 all ready, shipped out today, ill get the 399754 thanks
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Old 02-24-2010, 11:50 PM
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damm ok thanks anyways
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Old 05-03-2010, 10:25 PM
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any one remeber what size bolts you used to mount the converter to the flexplate?
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