All I'm saying is be safe.
Ok so what just happened here? I edited the above comment into a previous post, and the original post evaporated.
The original post said something like; you have to jack the car really high to roll the diff out on the wheels. This puts the car on a very significant angle,and the frame will want to slide off the jackstands.This is not a happy thought for me as I'm sliding underneath, on a creeper,or worse shimmying in on cardboard, to undo stuff.Blocking the brake pedal down, will serve two functions; 1) it will block the compensating port closed,preventing the M/C from draining, and 2) it will lock the front brakes, leading you to believe the car will not roll off the jackstands. If you trust your life to that, or wheel-chocks,so-be-it.
As for me, I lift the entire car up level.And slide the rear out on a floor-jack.
How you do it is up to you, just play it safe.