You're coming up on 20 year old wear items so every suspension and driveline component should be inspected in detail. Here is a good thread with many of the parts you'll need.
https://hummer4x4offroad.com/forum/threads/amazon-parts-reference-for-the-h3.10896/
Probably why there is an issue, even the 07 version of the 3.7 needs to have parts reused from the 06 but it is minimal. Not knowing this would cause a headache. Might consider reaching out to Badlands Industries in Nevada (I think). He has TONS of knowledge of these swaps...
Why didn't you leave the tranny out completely until after the motor was in? Is there a reason it was in the way? I'll be doing this swap in a couple of months on my 06.
How much for the ECM/TCM mounting bracket? I have one that is cracked and JB welded together. I'll be in Amarillo in May and would have you ship it there or may drive down with some tools.
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