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Here are the basics from my install in case the "May have to modify" from my post above has you worried. This is literally all you have to connect on your own. The rest of it is the included wiring harness, plug and play. Then if you are adventurous there are other options you can use...

Quick 2 vs Quick 4 and who to buy it from. The USShift.com Quick 4 has more features and cost less if you buy it direct. IMO there is no reason to spend double for less of a product. If you are inclined to go with the Quick 2 then buying direct with a wiring harness will cost about $600 vs BD...

A 4L80/85 will default to 2nd gear. It isn't so much a limp mode as a default. I found this out when doing my 4L80 swap and talking to the TCM controller tech support to make sure I was setting it up correctly. It displayed 2nd upon power up and that didn't seem right to me so I called...

Not all 4L80's are created equal. There are early and late models and there were running updates. At some point they added a bolt hole for LS engines. Then the 4L85 is an upgrade planetary but still a bolt in for a 4L80. When I was looking for one for my HMMWV I found the 2000ish and up were...