You can put a piece of 2x4 between the jack and the pan and jack it until it moves about 1/2-1 inch. Then you can remove the cross member after removing the underbody protection.
You will need a 2nd jack or a stand and support the transfer case also using a piece of 2x4 to remove and replace the pan. I just used a cheap scissor jack to support the transfer case while removing the pan.
I whish I took more pics.
There is a very long bolt goes through the transfer case and rubber mount, you will need to play with the jack to line up the holes. I did remove everything since I was servicing the transfer case also and the fill hole is simply inaccessible even with the "special tool" for low clearance plugs.
If anyone needs torque specs let me know.

I went through all this since I installed new pan, drain/filled the transfer case and since the underbody protection was off I sprayed it with fluid film (we live in a no-salt area but I still spray all of our vehicles every 3-4 years, it protects and lubricates the rubber and plastic besides the metal).