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I have not done the swap, I am doing a 4L80E swap. I did a lot of research though befrore making my decision. Nothing wrong with the 700R4 but I wanted to loose the female coupler sleeve that is in the stock adapter. As far as your question the TH350 and 700R4 have the same bolt pattern for a tailshaft housing (that is where the adapter bolts to). The only part needed from AA is the new output shaft for the 700R4. You would use the stock TH350-NP205 adapter. I do not know of anybody who makes another option at this time but I would imagine it would be much more expensive than the AA output shaft if it was a complete adapter assembly.
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