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I've been looking into the same issue. Here's what I've found out.
The only transmission that will bolt up is the 2.9. This is not recommended due to gear ratios, but it will work.
If you have an A4LD, the bellhousing may be removable. If so, you can swap the bellhousings, and use the same transmission.
From what I can gather...other than those two, no other trans will bolt up to the 4.0
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