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Old 03-12-2020, 01:45 PM   #9
MARKDTN
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Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,197
Re: Anyone swap in an lt1 with the original sm465?

Pretty sure the 6-speeds have a different clutch type than an old 4-speed. I think you can use a Vortec 4.3 or 5.7 Flywheel for a 5-speed with the pressure plate for the late truck and a disc for your original truck. Just be sure that they are the same diameter.
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