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I think but can't be sure that you will need some kind of adapter to mate the 4l80E trans to the 6.2 engine. Again I would PM Retired War Horse on this forum as well as the G.503 forum or Ted Gates.
Retired War Horse is in Northern Calif.
The G503 forum has a nice HMMWV section you may also...
I would send Retired War Horse a PM. He is in the business of doing the upgrade.
I did mine a while back but it was at the same time I did the upgrade to the 6.5NA.
First off what is your goal.
Why are you doing the upgrade?
Is it just to get park? You can install a park pawl in the 3l80...