At first we were alarmed when the ring gear didn't seem to fit on the carrier. Our technician at Randy's told us this is normal. The ring gear is supposed to fit snugly. One way to install the ring is to lube the inside of the gear where it fits on the carrier, or by placing the ring gear in an oven with a temp no higher than 187 degrees. This will help it slip on. It's normal to have to use a rubber mallet to tap the gear into place. Just don't use a metal hammer.