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Originally Posted by guruerror
MUD, can you post up some info/link about a 4l65 to 4l80 upgrade for an H2. I did a quick search on the forum and Google and came up with some, but not much.
You seem like you've got some knowledge...please share.
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These guys have everything needed, even the cross member.
http://www.transmissioncenter.net/4l60e.htm#4L60E to 4L80E
You can use your origional computer w/ a custom tune to run the 4l80.
I dont remember any detailed posts on any of the hummer forums, but if you check out performancetrucks.net or ls1tech- They have tons of info there.