4l80 yoke and riveshaft question
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The exact yoke will depend upon the specific 4L80E you get.
Beyond that, perhaps someone that has performed a T56 to 4L80E conversion can tell you if you need a shorter/longer driveshaft.
You can typically use the existing driveshaft with a yoke change.
We machine the output shafts as necessary when we build them. Most shops aren't savvy enough to know to do this and many don't have a lathe to do it with.
There are other solutions but first take the tailhousing off and post a pic of the output shaft.





