I used a 4r70 out of an awd explorer. No mods to the tail shaft. You do need to cut/die-grind the tail housing for clearance of the shift mechanism on the 205. Just use the 205 gasket as a template.
In addition to the original question, I did not use the trans mount. My “transmission mount” is only off the rear of the 205. I figured the 205 was too heavy for the back of the 4r70 without supporting the 205.
I recently completed the rubicon trail and didn’t have any issues without the transmission mount being used.
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