See, we had to build the racecar at my house because I’m not married so I’m allowed to use the oven for car parts:
The trick of baking the ring gear in the oven at 350 degrees worked like a charm. It dropped right onto the flywheel.
I thoroughly cleaned the flywheel edge and inside of the ring gear using a green scotch-brite pad and brake cleaner before putting the gear back on. You especially want to make sure the ring gear doesn’t have any junk on it because it will smoke/stink up your house in the oven.
I put the flywheel on the kitchen floor right next to the oven and on top of an old piece of wood (to protect the floor). Once the ring was heated through (10 minutes or so) I grabbed the ring with pot holders and went from the oven directly to the flywheel within a second or two. Piece of cake.
I removed it using a hammer and punch–just went gently around the perimeter and it was off in a couple of minutes.