I recently pulled out the center section on the 9" rear end in my car. Gravity was there to help me get it out, but I knew putting it back in wasn't going to be as easy. I don't like laying on the garage floor and wrestling a center chunk into position. And I've seen something like this before, so I borrowed someone else's idea and made a sketch. Since I've got two other project cars that will use 9" rears (if I live that long), I decided to build little fixture to help do the install. The base is a piece of scrap steel plate, about 5"x10". A piece of 2" angle (actually square tubing scrap) is notched for clearance around the center chunk and housing studs. Also small "L" shaped pieces are welded to it to support the chunk. An adjustable strap is slotted and bent from some 1.25"x12" scrap and the base is slotted to allow for different pinion yokes. A 4" piece of 1" round tubing is welded to the bottom. It temporarily replaces the "cup" on my floor jack and allows me to wheel the chunk into position, raise it and slide it onto the studs without breaking a sweat (or using nasty words). Now that I know it works I should probably take some time to paint it. You probably have one in your garage, you just need to do a little fab work.