Welcome to 2CarPros.
There really isn't a specific distance, but I can tell you it will be easier to just take the transmission out. It will already be unbolted and in the way if you leave it. Keep in mind, when you pull the transmission back, the trans tunnel gets narrower.
I attached a picture of the alignment tool being used. You can see it requires some room.
Let me know if I can help.
Joe
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Wednesday, June 12th, 2019 AT 10:10 PM