I took 1"x1" and nailed a jack pad square, onto the backside of a piece of 3/4 plywood. I routed out the drain plug boss, to keep the trans level. It doesn't have to be very big. Come in from the front, and the rear remains open. NOW, ask me why I forgot to bring it to Gregs house when we removed it!! Welding one up to use the jack mandrel is the final solution, just like Andy mentioned.