Hi and thanks for using 2CarPros.
If you are referring to how to hold the engine in place, a cross beam unit is used. Basically, it fits from one strut tower to the other. The engine is placed on it and maintained while work is being done.
As far as the transmission itself, there are specially designed transmission jacks which hold the transmission in place so it doesn't slip and fall. There are many different styles. I found one online for you to see.
I hope that is what you were looking for.
Monday, November 26th, 2018 AT 6:19 PM