The convertor extension fit completely into the hole on the 5.3. I test bolted the convertor to the flywheel and the extension went completely in and fit like it was meant for it. The convertor was built with the dished flywheel design. Dont know if it was just this one or they changed them in 2005 but it looks exactly like a lsx style convertor. I did not see any space where an adapter extension would fit.
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