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Oh, your question is "how to I convert my Turbohydramatic 400 transmission to a 4L80E Turbohydramatic transmission. Search 4L80E in the HMMWV forum, subject has been covered over and over.
Your question is not clear. The only difference between a GM 6.5 and a GEP 6.5 are internal casting changes to prevent cracks. Possibly you mean 6.5 NA to 6.5 turbocharged?